1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "code/codeCache.hpp" 27 #include "code/compiledIC.hpp" 28 #include "code/dependencies.hpp" 29 #include "code/nmethod.hpp" 30 #include "code/scopeDesc.hpp" 31 #include "compiler/abstractCompiler.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/compileLog.hpp" 34 #include "compiler/compilerOracle.hpp" 35 #include "compiler/disassembler.hpp" 36 #include "interpreter/bytecode.hpp" 37 #include "oops/methodData.hpp" 38 #include "prims/jvmtiRedefineClassesTrace.hpp" 39 #include "prims/jvmtiImpl.hpp" 40 #include "runtime/atomic.inline.hpp" 41 #include "runtime/orderAccess.inline.hpp" 42 #include "runtime/sharedRuntime.hpp" 43 #include "runtime/sweeper.hpp" 44 #include "utilities/dtrace.hpp" 45 #include "utilities/events.hpp" 46 #include "utilities/xmlstream.hpp" 47 #ifdef SHARK 48 #include "shark/sharkCompiler.hpp" 49 #endif 50 51 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC 52 53 unsigned char nmethod::_global_unloading_clock = 0; 54 55 #ifdef DTRACE_ENABLED 56 57 // Only bother with this argument setup if dtrace is available 58 59 #ifndef USDT2 60 HS_DTRACE_PROBE_DECL8(hotspot, compiled__method__load, 61 const char*, int, const char*, int, const char*, int, void*, size_t); 62 63 HS_DTRACE_PROBE_DECL6(hotspot, compiled__method__unload, 64 char*, int, char*, int, char*, int); 65 66 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 67 { \ 68 Method* m = (method); \ 69 if (m != NULL) { \ 70 Symbol* klass_name = m->klass_name(); \ 71 Symbol* name = m->name(); \ 72 Symbol* signature = m->signature(); \ 73 HS_DTRACE_PROBE6(hotspot, compiled__method__unload, \ 74 klass_name->bytes(), klass_name->utf8_length(), \ 75 name->bytes(), name->utf8_length(), \ 76 signature->bytes(), signature->utf8_length()); \ 77 } \ 78 } 79 #else /* USDT2 */ 80 #define DTRACE_METHOD_UNLOAD_PROBE(method) \ 81 { \ 82 Method* m = (method); \ 83 if (m != NULL) { \ 84 Symbol* klass_name = m->klass_name(); \ 85 Symbol* name = m->name(); \ 86 Symbol* signature = m->signature(); \ 87 HOTSPOT_COMPILED_METHOD_UNLOAD( \ 88 (char *) klass_name->bytes(), klass_name->utf8_length(), \ 89 (char *) name->bytes(), name->utf8_length(), \ 90 (char *) signature->bytes(), signature->utf8_length()); \ 91 } \ 92 } 93 #endif /* USDT2 */ 94 95 #else // ndef DTRACE_ENABLED 96 97 #define DTRACE_METHOD_UNLOAD_PROBE(method) 98 99 #endif 100 101 bool nmethod::is_compiled_by_c1() const { 102 if (compiler() == NULL) { 103 return false; 104 } 105 return compiler()->is_c1(); 106 } 107 bool nmethod::is_compiled_by_c2() const { 108 if (compiler() == NULL) { 109 return false; 110 } 111 return compiler()->is_c2(); 112 } 113 bool nmethod::is_compiled_by_shark() const { 114 if (compiler() == NULL) { 115 return false; 116 } 117 return compiler()->is_shark(); 118 } 119 120 121 122 //--------------------------------------------------------------------------------- 123 // NMethod statistics 124 // They are printed under various flags, including: 125 // PrintC1Statistics, PrintOptoStatistics, LogVMOutput, and LogCompilation. 126 // (In the latter two cases, they like other stats are printed to the log only.) 127 128 #ifndef PRODUCT 129 // These variables are put into one block to reduce relocations 130 // and make it simpler to print from the debugger. 131 static 132 struct nmethod_stats_struct { 133 int nmethod_count; 134 int total_size; 135 int relocation_size; 136 int consts_size; 137 int insts_size; 138 int stub_size; 139 int scopes_data_size; 140 int scopes_pcs_size; 141 int dependencies_size; 142 int handler_table_size; 143 int nul_chk_table_size; 144 int oops_size; 145 146 void note_nmethod(nmethod* nm) { 147 nmethod_count += 1; 148 total_size += nm->size(); 149 relocation_size += nm->relocation_size(); 150 consts_size += nm->consts_size(); 151 insts_size += nm->insts_size(); 152 stub_size += nm->stub_size(); 153 oops_size += nm->oops_size(); 154 scopes_data_size += nm->scopes_data_size(); 155 scopes_pcs_size += nm->scopes_pcs_size(); 156 dependencies_size += nm->dependencies_size(); 157 handler_table_size += nm->handler_table_size(); 158 nul_chk_table_size += nm->nul_chk_table_size(); 159 } 160 void print_nmethod_stats() { 161 if (nmethod_count == 0) return; 162 tty->print_cr("Statistics for %d bytecoded nmethods:", nmethod_count); 163 if (total_size != 0) tty->print_cr(" total in heap = %d", total_size); 164 if (relocation_size != 0) tty->print_cr(" relocation = %d", relocation_size); 165 if (consts_size != 0) tty->print_cr(" constants = %d", consts_size); 166 if (insts_size != 0) tty->print_cr(" main code = %d", insts_size); 167 if (stub_size != 0) tty->print_cr(" stub code = %d", stub_size); 168 if (oops_size != 0) tty->print_cr(" oops = %d", oops_size); 169 if (scopes_data_size != 0) tty->print_cr(" scopes data = %d", scopes_data_size); 170 if (scopes_pcs_size != 0) tty->print_cr(" scopes pcs = %d", scopes_pcs_size); 171 if (dependencies_size != 0) tty->print_cr(" dependencies = %d", dependencies_size); 172 if (handler_table_size != 0) tty->print_cr(" handler table = %d", handler_table_size); 173 if (nul_chk_table_size != 0) tty->print_cr(" nul chk table = %d", nul_chk_table_size); 174 } 175 176 int native_nmethod_count; 177 int native_total_size; 178 int native_relocation_size; 179 int native_insts_size; 180 int native_oops_size; 181 void note_native_nmethod(nmethod* nm) { 182 native_nmethod_count += 1; 183 native_total_size += nm->size(); 184 native_relocation_size += nm->relocation_size(); 185 native_insts_size += nm->insts_size(); 186 native_oops_size += nm->oops_size(); 187 } 188 void print_native_nmethod_stats() { 189 if (native_nmethod_count == 0) return; 190 tty->print_cr("Statistics for %d native nmethods:", native_nmethod_count); 191 if (native_total_size != 0) tty->print_cr(" N. total size = %d", native_total_size); 192 if (native_relocation_size != 0) tty->print_cr(" N. relocation = %d", native_relocation_size); 193 if (native_insts_size != 0) tty->print_cr(" N. main code = %d", native_insts_size); 194 if (native_oops_size != 0) tty->print_cr(" N. oops = %d", native_oops_size); 195 } 196 197 int pc_desc_resets; // number of resets (= number of caches) 198 int pc_desc_queries; // queries to nmethod::find_pc_desc 199 int pc_desc_approx; // number of those which have approximate true 200 int pc_desc_repeats; // number of _pc_descs[0] hits 201 int pc_desc_hits; // number of LRU cache hits 202 int pc_desc_tests; // total number of PcDesc examinations 203 int pc_desc_searches; // total number of quasi-binary search steps 204 int pc_desc_adds; // number of LUR cache insertions 205 206 void print_pc_stats() { 207 tty->print_cr("PcDesc Statistics: %d queries, %.2f comparisons per query", 208 pc_desc_queries, 209 (double)(pc_desc_tests + pc_desc_searches) 210 / pc_desc_queries); 211 tty->print_cr(" caches=%d queries=%d/%d, hits=%d+%d, tests=%d+%d, adds=%d", 212 pc_desc_resets, 213 pc_desc_queries, pc_desc_approx, 214 pc_desc_repeats, pc_desc_hits, 215 pc_desc_tests, pc_desc_searches, pc_desc_adds); 216 } 217 } nmethod_stats; 218 #endif //PRODUCT 219 220 221 //--------------------------------------------------------------------------------- 222 223 224 ExceptionCache::ExceptionCache(Handle exception, address pc, address handler) { 225 assert(pc != NULL, "Must be non null"); 226 assert(exception.not_null(), "Must be non null"); 227 assert(handler != NULL, "Must be non null"); 228 229 _count = 0; 230 _exception_type = exception->klass(); 231 _next = NULL; 232 233 add_address_and_handler(pc,handler); 234 } 235 236 237 address ExceptionCache::match(Handle exception, address pc) { 238 assert(pc != NULL,"Must be non null"); 239 assert(exception.not_null(),"Must be non null"); 240 if (exception->klass() == exception_type()) { 241 return (test_address(pc)); 242 } 243 244 return NULL; 245 } 246 247 248 bool ExceptionCache::match_exception_with_space(Handle exception) { 249 assert(exception.not_null(),"Must be non null"); 250 if (exception->klass() == exception_type() && count() < cache_size) { 251 return true; 252 } 253 return false; 254 } 255 256 257 address ExceptionCache::test_address(address addr) { 258 for (int i=0; i<count(); i++) { 259 if (pc_at(i) == addr) { 260 return handler_at(i); 261 } 262 } 263 return NULL; 264 } 265 266 267 bool ExceptionCache::add_address_and_handler(address addr, address handler) { 268 if (test_address(addr) == handler) return true; 269 if (count() < cache_size) { 270 set_pc_at(count(),addr); 271 set_handler_at(count(), handler); 272 increment_count(); 273 return true; 274 } 275 return false; 276 } 277 278 279 // private method for handling exception cache 280 // These methods are private, and used to manipulate the exception cache 281 // directly. 282 ExceptionCache* nmethod::exception_cache_entry_for_exception(Handle exception) { 283 ExceptionCache* ec = exception_cache(); 284 while (ec != NULL) { 285 if (ec->match_exception_with_space(exception)) { 286 return ec; 287 } 288 ec = ec->next(); 289 } 290 return NULL; 291 } 292 293 294 //----------------------------------------------------------------------------- 295 296 297 // Helper used by both find_pc_desc methods. 298 static inline bool match_desc(PcDesc* pc, int pc_offset, bool approximate) { 299 NOT_PRODUCT(++nmethod_stats.pc_desc_tests); 300 if (!approximate) 301 return pc->pc_offset() == pc_offset; 302 else 303 return (pc-1)->pc_offset() < pc_offset && pc_offset <= pc->pc_offset(); 304 } 305 306 void PcDescCache::reset_to(PcDesc* initial_pc_desc) { 307 if (initial_pc_desc == NULL) { 308 _pc_descs[0] = NULL; // native method; no PcDescs at all 309 return; 310 } 311 NOT_PRODUCT(++nmethod_stats.pc_desc_resets); 312 // reset the cache by filling it with benign (non-null) values 313 assert(initial_pc_desc->pc_offset() < 0, "must be sentinel"); 314 for (int i = 0; i < cache_size; i++) 315 _pc_descs[i] = initial_pc_desc; 316 } 317 318 PcDesc* PcDescCache::find_pc_desc(int pc_offset, bool approximate) { 319 NOT_PRODUCT(++nmethod_stats.pc_desc_queries); 320 NOT_PRODUCT(if (approximate) ++nmethod_stats.pc_desc_approx); 321 322 // Note: one might think that caching the most recently 323 // read value separately would be a win, but one would be 324 // wrong. When many threads are updating it, the cache 325 // line it's in would bounce between caches, negating 326 // any benefit. 327 328 // In order to prevent race conditions do not load cache elements 329 // repeatedly, but use a local copy: 330 PcDesc* res; 331 332 // Step one: Check the most recently added value. 333 res = _pc_descs[0]; 334 if (res == NULL) return NULL; // native method; no PcDescs at all 335 if (match_desc(res, pc_offset, approximate)) { 336 NOT_PRODUCT(++nmethod_stats.pc_desc_repeats); 337 return res; 338 } 339 340 // Step two: Check the rest of the LRU cache. 341 for (int i = 1; i < cache_size; ++i) { 342 res = _pc_descs[i]; 343 if (res->pc_offset() < 0) break; // optimization: skip empty cache 344 if (match_desc(res, pc_offset, approximate)) { 345 NOT_PRODUCT(++nmethod_stats.pc_desc_hits); 346 return res; 347 } 348 } 349 350 // Report failure. 351 return NULL; 352 } 353 354 void PcDescCache::add_pc_desc(PcDesc* pc_desc) { 355 NOT_PRODUCT(++nmethod_stats.pc_desc_adds); 356 // Update the LRU cache by shifting pc_desc forward. 357 for (int i = 0; i < cache_size; i++) { 358 PcDesc* next = _pc_descs[i]; 359 _pc_descs[i] = pc_desc; 360 pc_desc = next; 361 } 362 } 363 364 // adjust pcs_size so that it is a multiple of both oopSize and 365 // sizeof(PcDesc) (assumes that if sizeof(PcDesc) is not a multiple 366 // of oopSize, then 2*sizeof(PcDesc) is) 367 static int adjust_pcs_size(int pcs_size) { 368 int nsize = round_to(pcs_size, oopSize); 369 if ((nsize % sizeof(PcDesc)) != 0) { 370 nsize = pcs_size + sizeof(PcDesc); 371 } 372 assert((nsize % oopSize) == 0, "correct alignment"); 373 return nsize; 374 } 375 376 //----------------------------------------------------------------------------- 377 378 379 void nmethod::add_exception_cache_entry(ExceptionCache* new_entry) { 380 assert(ExceptionCache_lock->owned_by_self(),"Must hold the ExceptionCache_lock"); 381 assert(new_entry != NULL,"Must be non null"); 382 assert(new_entry->next() == NULL, "Must be null"); 383 384 if (exception_cache() != NULL) { 385 new_entry->set_next(exception_cache()); 386 } 387 set_exception_cache(new_entry); 388 } 389 390 void nmethod::clean_exception_cache(BoolObjectClosure* is_alive) { 391 ExceptionCache* prev = NULL; 392 ExceptionCache* curr = exception_cache(); 393 394 while (curr != NULL) { 395 ExceptionCache* next = curr->next(); 396 397 Klass* ex_klass = curr->exception_type(); 398 if (ex_klass != NULL && !ex_klass->is_loader_alive(is_alive)) { 399 if (prev == NULL) { 400 set_exception_cache(next); 401 } else { 402 prev->set_next(next); 403 } 404 delete curr; 405 // prev stays the same. 406 } else { 407 prev = curr; 408 } 409 410 curr = next; 411 } 412 } 413 414 // public method for accessing the exception cache 415 // These are the public access methods. 416 address nmethod::handler_for_exception_and_pc(Handle exception, address pc) { 417 // We never grab a lock to read the exception cache, so we may 418 // have false negatives. This is okay, as it can only happen during 419 // the first few exception lookups for a given nmethod. 420 ExceptionCache* ec = exception_cache(); 421 while (ec != NULL) { 422 address ret_val; 423 if ((ret_val = ec->match(exception,pc)) != NULL) { 424 return ret_val; 425 } 426 ec = ec->next(); 427 } 428 return NULL; 429 } 430 431 432 void nmethod::add_handler_for_exception_and_pc(Handle exception, address pc, address handler) { 433 // There are potential race conditions during exception cache updates, so we 434 // must own the ExceptionCache_lock before doing ANY modifications. Because 435 // we don't lock during reads, it is possible to have several threads attempt 436 // to update the cache with the same data. We need to check for already inserted 437 // copies of the current data before adding it. 438 439 MutexLocker ml(ExceptionCache_lock); 440 ExceptionCache* target_entry = exception_cache_entry_for_exception(exception); 441 442 if (target_entry == NULL || !target_entry->add_address_and_handler(pc,handler)) { 443 target_entry = new ExceptionCache(exception,pc,handler); 444 add_exception_cache_entry(target_entry); 445 } 446 } 447 448 449 //-------------end of code for ExceptionCache-------------- 450 451 452 int nmethod::total_size() const { 453 return 454 consts_size() + 455 insts_size() + 456 stub_size() + 457 scopes_data_size() + 458 scopes_pcs_size() + 459 handler_table_size() + 460 nul_chk_table_size(); 461 } 462 463 const char* nmethod::compile_kind() const { 464 if (is_osr_method()) return "osr"; 465 if (method() != NULL && is_native_method()) return "c2n"; 466 return NULL; 467 } 468 469 // Fill in default values for various flag fields 470 void nmethod::init_defaults() { 471 _state = in_use; 472 _unloading_clock = 0; 473 _marked_for_reclamation = 0; 474 _has_flushed_dependencies = 0; 475 _has_unsafe_access = 0; 476 _has_method_handle_invokes = 0; 477 _lazy_critical_native = 0; 478 _has_wide_vectors = 0; 479 _marked_for_deoptimization = 0; 480 _lock_count = 0; 481 _stack_traversal_mark = 0; 482 _unload_reported = false; // jvmti state 483 484 #ifdef ASSERT 485 _oops_are_stale = false; 486 #endif 487 488 _oops_do_mark_link = NULL; 489 _jmethod_id = NULL; 490 _osr_link = NULL; 491 if (UseG1GC) { 492 _unloading_next = NULL; 493 } else { 494 _scavenge_root_link = NULL; 495 } 496 _scavenge_root_state = 0; 497 _compiler = NULL; 498 #if INCLUDE_RTM_OPT 499 _rtm_state = NoRTM; 500 #endif 501 #ifdef HAVE_DTRACE_H 502 _trap_offset = 0; 503 #endif // def HAVE_DTRACE_H 504 } 505 506 nmethod* nmethod::new_native_nmethod(methodHandle method, 507 int compile_id, 508 CodeBuffer *code_buffer, 509 int vep_offset, 510 int frame_complete, 511 int frame_size, 512 ByteSize basic_lock_owner_sp_offset, 513 ByteSize basic_lock_sp_offset, 514 OopMapSet* oop_maps) { 515 code_buffer->finalize_oop_references(method); 516 // create nmethod 517 nmethod* nm = NULL; 518 { 519 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 520 int native_nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 521 CodeOffsets offsets; 522 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 523 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 524 nm = new (native_nmethod_size) nmethod(method(), native_nmethod_size, 525 compile_id, &offsets, 526 code_buffer, frame_size, 527 basic_lock_owner_sp_offset, 528 basic_lock_sp_offset, oop_maps); 529 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_native_nmethod(nm)); 530 if (PrintAssembly && nm != NULL) { 531 Disassembler::decode(nm); 532 } 533 } 534 // verify nmethod 535 debug_only(if (nm) nm->verify();) // might block 536 537 if (nm != NULL) { 538 nm->log_new_nmethod(); 539 } 540 541 return nm; 542 } 543 544 #ifdef HAVE_DTRACE_H 545 nmethod* nmethod::new_dtrace_nmethod(methodHandle method, 546 CodeBuffer *code_buffer, 547 int vep_offset, 548 int trap_offset, 549 int frame_complete, 550 int frame_size) { 551 code_buffer->finalize_oop_references(method); 552 // create nmethod 553 nmethod* nm = NULL; 554 { 555 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 556 int nmethod_size = allocation_size(code_buffer, sizeof(nmethod)); 557 CodeOffsets offsets; 558 offsets.set_value(CodeOffsets::Verified_Entry, vep_offset); 559 offsets.set_value(CodeOffsets::Dtrace_trap, trap_offset); 560 offsets.set_value(CodeOffsets::Frame_Complete, frame_complete); 561 562 nm = new (nmethod_size) nmethod(method(), nmethod_size, 563 &offsets, code_buffer, frame_size); 564 565 NOT_PRODUCT(if (nm != NULL) nmethod_stats.note_nmethod(nm)); 566 if (PrintAssembly && nm != NULL) { 567 Disassembler::decode(nm); 568 } 569 } 570 // verify nmethod 571 debug_only(if (nm) nm->verify();) // might block 572 573 if (nm != NULL) { 574 nm->log_new_nmethod(); 575 } 576 577 return nm; 578 } 579 580 #endif // def HAVE_DTRACE_H 581 582 nmethod* nmethod::new_nmethod(methodHandle method, 583 int compile_id, 584 int entry_bci, 585 CodeOffsets* offsets, 586 int orig_pc_offset, 587 DebugInformationRecorder* debug_info, 588 Dependencies* dependencies, 589 CodeBuffer* code_buffer, int frame_size, 590 OopMapSet* oop_maps, 591 ExceptionHandlerTable* handler_table, 592 ImplicitExceptionTable* nul_chk_table, 593 AbstractCompiler* compiler, 594 int comp_level 595 ) 596 { 597 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 598 code_buffer->finalize_oop_references(method); 599 // create nmethod 600 nmethod* nm = NULL; 601 { MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 602 int nmethod_size = 603 allocation_size(code_buffer, sizeof(nmethod)) 604 + adjust_pcs_size(debug_info->pcs_size()) 605 + round_to(dependencies->size_in_bytes() , oopSize) 606 + round_to(handler_table->size_in_bytes(), oopSize) 607 + round_to(nul_chk_table->size_in_bytes(), oopSize) 608 + round_to(debug_info->data_size() , oopSize); 609 610 nm = new (nmethod_size) 611 nmethod(method(), nmethod_size, compile_id, entry_bci, offsets, 612 orig_pc_offset, debug_info, dependencies, code_buffer, frame_size, 613 oop_maps, 614 handler_table, 615 nul_chk_table, 616 compiler, 617 comp_level); 618 619 if (nm != NULL) { 620 // To make dependency checking during class loading fast, record 621 // the nmethod dependencies in the classes it is dependent on. 622 // This allows the dependency checking code to simply walk the 623 // class hierarchy above the loaded class, checking only nmethods 624 // which are dependent on those classes. The slow way is to 625 // check every nmethod for dependencies which makes it linear in 626 // the number of methods compiled. For applications with a lot 627 // classes the slow way is too slow. 628 for (Dependencies::DepStream deps(nm); deps.next(); ) { 629 Klass* klass = deps.context_type(); 630 if (klass == NULL) { 631 continue; // ignore things like evol_method 632 } 633 634 // record this nmethod as dependent on this klass 635 InstanceKlass::cast(klass)->add_dependent_nmethod(nm); 636 } 637 NOT_PRODUCT(nmethod_stats.note_nmethod(nm)); 638 if (PrintAssembly || CompilerOracle::has_option_string(method, "PrintAssembly")) { 639 Disassembler::decode(nm); 640 } 641 } 642 } 643 // Do verification and logging outside CodeCache_lock. 644 if (nm != NULL) { 645 // Safepoints in nmethod::verify aren't allowed because nm hasn't been installed yet. 646 DEBUG_ONLY(nm->verify();) 647 nm->log_new_nmethod(); 648 } 649 return nm; 650 } 651 652 653 // For native wrappers 654 nmethod::nmethod( 655 Method* method, 656 int nmethod_size, 657 int compile_id, 658 CodeOffsets* offsets, 659 CodeBuffer* code_buffer, 660 int frame_size, 661 ByteSize basic_lock_owner_sp_offset, 662 ByteSize basic_lock_sp_offset, 663 OopMapSet* oop_maps ) 664 : CodeBlob("native nmethod", code_buffer, sizeof(nmethod), 665 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 666 _native_receiver_sp_offset(basic_lock_owner_sp_offset), 667 _native_basic_lock_sp_offset(basic_lock_sp_offset) 668 { 669 { 670 debug_only(No_Safepoint_Verifier nsv;) 671 assert_locked_or_safepoint(CodeCache_lock); 672 673 init_defaults(); 674 _method = method; 675 _entry_bci = InvocationEntryBci; 676 // We have no exception handler or deopt handler make the 677 // values something that will never match a pc like the nmethod vtable entry 678 _exception_offset = 0; 679 _deoptimize_offset = 0; 680 _deoptimize_mh_offset = 0; 681 _orig_pc_offset = 0; 682 683 _consts_offset = data_offset(); 684 _stub_offset = data_offset(); 685 _oops_offset = data_offset(); 686 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 687 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 688 _scopes_pcs_offset = _scopes_data_offset; 689 _dependencies_offset = _scopes_pcs_offset; 690 _handler_table_offset = _dependencies_offset; 691 _nul_chk_table_offset = _handler_table_offset; 692 _nmethod_end_offset = _nul_chk_table_offset; 693 _compile_id = compile_id; 694 _comp_level = CompLevel_none; 695 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 696 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 697 _osr_entry_point = NULL; 698 _exception_cache = NULL; 699 _pc_desc_cache.reset_to(NULL); 700 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 701 702 code_buffer->copy_values_to(this); 703 if (ScavengeRootsInCode) { 704 if (detect_scavenge_root_oops()) { 705 CodeCache::add_scavenge_root_nmethod(this); 706 } 707 Universe::heap()->register_nmethod(this); 708 } 709 debug_only(verify_scavenge_root_oops()); 710 CodeCache::commit(this); 711 } 712 713 if (PrintNativeNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 714 ttyLocker ttyl; // keep the following output all in one block 715 // This output goes directly to the tty, not the compiler log. 716 // To enable tools to match it up with the compilation activity, 717 // be sure to tag this tty output with the compile ID. 718 if (xtty != NULL) { 719 xtty->begin_head("print_native_nmethod"); 720 xtty->method(_method); 721 xtty->stamp(); 722 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 723 } 724 // print the header part first 725 print(); 726 // then print the requested information 727 if (PrintNativeNMethods) { 728 print_code(); 729 if (oop_maps != NULL) { 730 oop_maps->print(); 731 } 732 } 733 if (PrintRelocations) { 734 print_relocations(); 735 } 736 if (xtty != NULL) { 737 xtty->tail("print_native_nmethod"); 738 } 739 } 740 } 741 742 // For dtrace wrappers 743 #ifdef HAVE_DTRACE_H 744 nmethod::nmethod( 745 Method* method, 746 int nmethod_size, 747 CodeOffsets* offsets, 748 CodeBuffer* code_buffer, 749 int frame_size) 750 : CodeBlob("dtrace nmethod", code_buffer, sizeof(nmethod), 751 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, NULL), 752 _native_receiver_sp_offset(in_ByteSize(-1)), 753 _native_basic_lock_sp_offset(in_ByteSize(-1)) 754 { 755 { 756 debug_only(No_Safepoint_Verifier nsv;) 757 assert_locked_or_safepoint(CodeCache_lock); 758 759 init_defaults(); 760 _method = method; 761 _entry_bci = InvocationEntryBci; 762 // We have no exception handler or deopt handler make the 763 // values something that will never match a pc like the nmethod vtable entry 764 _exception_offset = 0; 765 _deoptimize_offset = 0; 766 _deoptimize_mh_offset = 0; 767 _unwind_handler_offset = -1; 768 _trap_offset = offsets->value(CodeOffsets::Dtrace_trap); 769 _orig_pc_offset = 0; 770 _consts_offset = data_offset(); 771 _stub_offset = data_offset(); 772 _oops_offset = data_offset(); 773 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 774 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 775 _scopes_pcs_offset = _scopes_data_offset; 776 _dependencies_offset = _scopes_pcs_offset; 777 _handler_table_offset = _dependencies_offset; 778 _nul_chk_table_offset = _handler_table_offset; 779 _nmethod_end_offset = _nul_chk_table_offset; 780 _compile_id = 0; // default 781 _comp_level = CompLevel_none; 782 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 783 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 784 _osr_entry_point = NULL; 785 _exception_cache = NULL; 786 _pc_desc_cache.reset_to(NULL); 787 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 788 789 code_buffer->copy_values_to(this); 790 if (ScavengeRootsInCode) { 791 if (detect_scavenge_root_oops()) { 792 CodeCache::add_scavenge_root_nmethod(this); 793 } 794 Universe::heap()->register_nmethod(this); 795 } 796 DEBUG_ONLY(verify_scavenge_root_oops();) 797 CodeCache::commit(this); 798 } 799 800 if (PrintNMethods || PrintDebugInfo || PrintRelocations || PrintDependencies) { 801 ttyLocker ttyl; // keep the following output all in one block 802 // This output goes directly to the tty, not the compiler log. 803 // To enable tools to match it up with the compilation activity, 804 // be sure to tag this tty output with the compile ID. 805 if (xtty != NULL) { 806 xtty->begin_head("print_dtrace_nmethod"); 807 xtty->method(_method); 808 xtty->stamp(); 809 xtty->end_head(" address='" INTPTR_FORMAT "'", (intptr_t) this); 810 } 811 // print the header part first 812 print(); 813 // then print the requested information 814 if (PrintNMethods) { 815 print_code(); 816 } 817 if (PrintRelocations) { 818 print_relocations(); 819 } 820 if (xtty != NULL) { 821 xtty->tail("print_dtrace_nmethod"); 822 } 823 } 824 } 825 #endif // def HAVE_DTRACE_H 826 827 void* nmethod::operator new(size_t size, int nmethod_size) throw() { 828 // Not critical, may return null if there is too little continuous memory 829 return CodeCache::allocate(nmethod_size); 830 } 831 832 nmethod::nmethod( 833 Method* method, 834 int nmethod_size, 835 int compile_id, 836 int entry_bci, 837 CodeOffsets* offsets, 838 int orig_pc_offset, 839 DebugInformationRecorder* debug_info, 840 Dependencies* dependencies, 841 CodeBuffer *code_buffer, 842 int frame_size, 843 OopMapSet* oop_maps, 844 ExceptionHandlerTable* handler_table, 845 ImplicitExceptionTable* nul_chk_table, 846 AbstractCompiler* compiler, 847 int comp_level 848 ) 849 : CodeBlob("nmethod", code_buffer, sizeof(nmethod), 850 nmethod_size, offsets->value(CodeOffsets::Frame_Complete), frame_size, oop_maps), 851 _native_receiver_sp_offset(in_ByteSize(-1)), 852 _native_basic_lock_sp_offset(in_ByteSize(-1)) 853 { 854 assert(debug_info->oop_recorder() == code_buffer->oop_recorder(), "shared OR"); 855 { 856 debug_only(No_Safepoint_Verifier nsv;) 857 assert_locked_or_safepoint(CodeCache_lock); 858 859 init_defaults(); 860 _method = method; 861 _entry_bci = entry_bci; 862 _compile_id = compile_id; 863 _comp_level = comp_level; 864 _compiler = compiler; 865 _orig_pc_offset = orig_pc_offset; 866 _hotness_counter = NMethodSweeper::hotness_counter_reset_val(); 867 868 // Section offsets 869 _consts_offset = content_offset() + code_buffer->total_offset_of(code_buffer->consts()); 870 _stub_offset = content_offset() + code_buffer->total_offset_of(code_buffer->stubs()); 871 872 // Exception handler and deopt handler are in the stub section 873 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must be set"); 874 assert(offsets->value(CodeOffsets::Deopt ) != -1, "must be set"); 875 _exception_offset = _stub_offset + offsets->value(CodeOffsets::Exceptions); 876 _deoptimize_offset = _stub_offset + offsets->value(CodeOffsets::Deopt); 877 if (offsets->value(CodeOffsets::DeoptMH) != -1) { 878 _deoptimize_mh_offset = _stub_offset + offsets->value(CodeOffsets::DeoptMH); 879 } else { 880 _deoptimize_mh_offset = -1; 881 } 882 if (offsets->value(CodeOffsets::UnwindHandler) != -1) { 883 _unwind_handler_offset = code_offset() + offsets->value(CodeOffsets::UnwindHandler); 884 } else { 885 _unwind_handler_offset = -1; 886 } 887 888 _oops_offset = data_offset(); 889 _metadata_offset = _oops_offset + round_to(code_buffer->total_oop_size(), oopSize); 890 _scopes_data_offset = _metadata_offset + round_to(code_buffer->total_metadata_size(), wordSize); 891 892 _scopes_pcs_offset = _scopes_data_offset + round_to(debug_info->data_size (), oopSize); 893 _dependencies_offset = _scopes_pcs_offset + adjust_pcs_size(debug_info->pcs_size()); 894 _handler_table_offset = _dependencies_offset + round_to(dependencies->size_in_bytes (), oopSize); 895 _nul_chk_table_offset = _handler_table_offset + round_to(handler_table->size_in_bytes(), oopSize); 896 _nmethod_end_offset = _nul_chk_table_offset + round_to(nul_chk_table->size_in_bytes(), oopSize); 897 898 _entry_point = code_begin() + offsets->value(CodeOffsets::Entry); 899 _verified_entry_point = code_begin() + offsets->value(CodeOffsets::Verified_Entry); 900 _osr_entry_point = code_begin() + offsets->value(CodeOffsets::OSR_Entry); 901 _exception_cache = NULL; 902 _pc_desc_cache.reset_to(scopes_pcs_begin()); 903 904 // Copy contents of ScopeDescRecorder to nmethod 905 code_buffer->copy_values_to(this); 906 debug_info->copy_to(this); 907 dependencies->copy_to(this); 908 if (ScavengeRootsInCode) { 909 if (detect_scavenge_root_oops()) { 910 CodeCache::add_scavenge_root_nmethod(this); 911 } 912 Universe::heap()->register_nmethod(this); 913 } 914 debug_only(verify_scavenge_root_oops()); 915 916 CodeCache::commit(this); 917 918 // Copy contents of ExceptionHandlerTable to nmethod 919 handler_table->copy_to(this); 920 nul_chk_table->copy_to(this); 921 922 // we use the information of entry points to find out if a method is 923 // static or non static 924 assert(compiler->is_c2() || 925 _method->is_static() == (entry_point() == _verified_entry_point), 926 " entry points must be same for static methods and vice versa"); 927 } 928 929 bool printnmethods = PrintNMethods 930 || CompilerOracle::should_print(_method) 931 || CompilerOracle::has_option_string(_method, "PrintNMethods"); 932 if (printnmethods || PrintDebugInfo || PrintRelocations || PrintDependencies || PrintExceptionHandlers) { 933 print_nmethod(printnmethods); 934 } 935 } 936 937 938 // Print a short set of xml attributes to identify this nmethod. The 939 // output should be embedded in some other element. 940 void nmethod::log_identity(xmlStream* log) const { 941 log->print(" compile_id='%d'", compile_id()); 942 const char* nm_kind = compile_kind(); 943 if (nm_kind != NULL) log->print(" compile_kind='%s'", nm_kind); 944 if (compiler() != NULL) { 945 log->print(" compiler='%s'", compiler()->name()); 946 } 947 if (TieredCompilation) { 948 log->print(" level='%d'", comp_level()); 949 } 950 } 951 952 953 #define LOG_OFFSET(log, name) \ 954 if ((intptr_t)name##_end() - (intptr_t)name##_begin()) \ 955 log->print(" " XSTR(name) "_offset='%d'" , \ 956 (intptr_t)name##_begin() - (intptr_t)this) 957 958 959 void nmethod::log_new_nmethod() const { 960 if (LogCompilation && xtty != NULL) { 961 ttyLocker ttyl; 962 HandleMark hm; 963 xtty->begin_elem("nmethod"); 964 log_identity(xtty); 965 xtty->print(" entry='" INTPTR_FORMAT "' size='%d'", code_begin(), size()); 966 xtty->print(" address='" INTPTR_FORMAT "'", (intptr_t) this); 967 968 LOG_OFFSET(xtty, relocation); 969 LOG_OFFSET(xtty, consts); 970 LOG_OFFSET(xtty, insts); 971 LOG_OFFSET(xtty, stub); 972 LOG_OFFSET(xtty, scopes_data); 973 LOG_OFFSET(xtty, scopes_pcs); 974 LOG_OFFSET(xtty, dependencies); 975 LOG_OFFSET(xtty, handler_table); 976 LOG_OFFSET(xtty, nul_chk_table); 977 LOG_OFFSET(xtty, oops); 978 979 xtty->method(method()); 980 xtty->stamp(); 981 xtty->end_elem(); 982 } 983 } 984 985 #undef LOG_OFFSET 986 987 988 // Print out more verbose output usually for a newly created nmethod. 989 void nmethod::print_on(outputStream* st, const char* msg) const { 990 if (st != NULL) { 991 ttyLocker ttyl; 992 if (WizardMode) { 993 CompileTask::print_compilation(st, this, msg, /*short_form:*/ true); 994 st->print_cr(" (" INTPTR_FORMAT ")", this); 995 } else { 996 CompileTask::print_compilation(st, this, msg, /*short_form:*/ false); 997 } 998 } 999 } 1000 1001 1002 void nmethod::print_nmethod(bool printmethod) { 1003 ttyLocker ttyl; // keep the following output all in one block 1004 if (xtty != NULL) { 1005 xtty->begin_head("print_nmethod"); 1006 xtty->stamp(); 1007 xtty->end_head(); 1008 } 1009 // print the header part first 1010 print(); 1011 // then print the requested information 1012 if (printmethod) { 1013 print_code(); 1014 print_pcs(); 1015 if (oop_maps()) { 1016 oop_maps()->print(); 1017 } 1018 } 1019 if (PrintDebugInfo) { 1020 print_scopes(); 1021 } 1022 if (PrintRelocations) { 1023 print_relocations(); 1024 } 1025 if (PrintDependencies) { 1026 print_dependencies(); 1027 } 1028 if (PrintExceptionHandlers) { 1029 print_handler_table(); 1030 print_nul_chk_table(); 1031 } 1032 if (xtty != NULL) { 1033 xtty->tail("print_nmethod"); 1034 } 1035 } 1036 1037 1038 // Promote one word from an assembly-time handle to a live embedded oop. 1039 inline void nmethod::initialize_immediate_oop(oop* dest, jobject handle) { 1040 if (handle == NULL || 1041 // As a special case, IC oops are initialized to 1 or -1. 1042 handle == (jobject) Universe::non_oop_word()) { 1043 (*dest) = (oop) handle; 1044 } else { 1045 (*dest) = JNIHandles::resolve_non_null(handle); 1046 } 1047 } 1048 1049 1050 // Have to have the same name because it's called by a template 1051 void nmethod::copy_values(GrowableArray<jobject>* array) { 1052 int length = array->length(); 1053 assert((address)(oops_begin() + length) <= (address)oops_end(), "oops big enough"); 1054 oop* dest = oops_begin(); 1055 for (int index = 0 ; index < length; index++) { 1056 initialize_immediate_oop(&dest[index], array->at(index)); 1057 } 1058 1059 // Now we can fix up all the oops in the code. We need to do this 1060 // in the code because the assembler uses jobjects as placeholders. 1061 // The code and relocations have already been initialized by the 1062 // CodeBlob constructor, so it is valid even at this early point to 1063 // iterate over relocations and patch the code. 1064 fix_oop_relocations(NULL, NULL, /*initialize_immediates=*/ true); 1065 } 1066 1067 void nmethod::copy_values(GrowableArray<Metadata*>* array) { 1068 int length = array->length(); 1069 assert((address)(metadata_begin() + length) <= (address)metadata_end(), "big enough"); 1070 Metadata** dest = metadata_begin(); 1071 for (int index = 0 ; index < length; index++) { 1072 dest[index] = array->at(index); 1073 } 1074 } 1075 1076 bool nmethod::is_at_poll_return(address pc) { 1077 RelocIterator iter(this, pc, pc+1); 1078 while (iter.next()) { 1079 if (iter.type() == relocInfo::poll_return_type) 1080 return true; 1081 } 1082 return false; 1083 } 1084 1085 1086 bool nmethod::is_at_poll_or_poll_return(address pc) { 1087 RelocIterator iter(this, pc, pc+1); 1088 while (iter.next()) { 1089 relocInfo::relocType t = iter.type(); 1090 if (t == relocInfo::poll_return_type || t == relocInfo::poll_type) 1091 return true; 1092 } 1093 return false; 1094 } 1095 1096 1097 void nmethod::fix_oop_relocations(address begin, address end, bool initialize_immediates) { 1098 // re-patch all oop-bearing instructions, just in case some oops moved 1099 RelocIterator iter(this, begin, end); 1100 while (iter.next()) { 1101 if (iter.type() == relocInfo::oop_type) { 1102 oop_Relocation* reloc = iter.oop_reloc(); 1103 if (initialize_immediates && reloc->oop_is_immediate()) { 1104 oop* dest = reloc->oop_addr(); 1105 initialize_immediate_oop(dest, (jobject) *dest); 1106 } 1107 // Refresh the oop-related bits of this instruction. 1108 reloc->fix_oop_relocation(); 1109 } else if (iter.type() == relocInfo::metadata_type) { 1110 metadata_Relocation* reloc = iter.metadata_reloc(); 1111 reloc->fix_metadata_relocation(); 1112 } 1113 } 1114 } 1115 1116 1117 void nmethod::verify_oop_relocations() { 1118 // Ensure sure that the code matches the current oop values 1119 RelocIterator iter(this, NULL, NULL); 1120 while (iter.next()) { 1121 if (iter.type() == relocInfo::oop_type) { 1122 oop_Relocation* reloc = iter.oop_reloc(); 1123 if (!reloc->oop_is_immediate()) { 1124 reloc->verify_oop_relocation(); 1125 } 1126 } 1127 } 1128 } 1129 1130 1131 ScopeDesc* nmethod::scope_desc_at(address pc) { 1132 PcDesc* pd = pc_desc_at(pc); 1133 guarantee(pd != NULL, "scope must be present"); 1134 return new ScopeDesc(this, pd->scope_decode_offset(), 1135 pd->obj_decode_offset(), pd->should_reexecute(), 1136 pd->return_oop()); 1137 } 1138 1139 1140 void nmethod::clear_inline_caches() { 1141 assert(SafepointSynchronize::is_at_safepoint(), "cleaning of IC's only allowed at safepoint"); 1142 if (is_zombie()) { 1143 return; 1144 } 1145 1146 RelocIterator iter(this); 1147 while (iter.next()) { 1148 iter.reloc()->clear_inline_cache(); 1149 } 1150 } 1151 1152 1153 void nmethod::cleanup_inline_caches() { 1154 1155 assert_locked_or_safepoint(CompiledIC_lock); 1156 1157 // If the method is not entrant or zombie then a JMP is plastered over the 1158 // first few bytes. If an oop in the old code was there, that oop 1159 // should not get GC'd. Skip the first few bytes of oops on 1160 // not-entrant methods. 1161 address low_boundary = verified_entry_point(); 1162 if (!is_in_use()) { 1163 low_boundary += NativeJump::instruction_size; 1164 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1165 // This means that the low_boundary is going to be a little too high. 1166 // This shouldn't matter, since oops of non-entrant methods are never used. 1167 // In fact, why are we bothering to look at oops in a non-entrant method?? 1168 } 1169 1170 // Find all calls in an nmethod, and clear the ones that points to zombie methods 1171 ResourceMark rm; 1172 RelocIterator iter(this, low_boundary); 1173 while(iter.next()) { 1174 switch(iter.type()) { 1175 case relocInfo::virtual_call_type: 1176 case relocInfo::opt_virtual_call_type: { 1177 CompiledIC *ic = CompiledIC_at(&iter); 1178 // Ok, to lookup references to zombies here 1179 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1180 if( cb != NULL && cb->is_nmethod() ) { 1181 nmethod* nm = (nmethod*)cb; 1182 // Clean inline caches pointing to both zombie and not_entrant methods 1183 if (!nm->is_in_use() || (nm->method()->code() != nm)) ic->set_to_clean(); 1184 } 1185 break; 1186 } 1187 case relocInfo::static_call_type: { 1188 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1189 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1190 if( cb != NULL && cb->is_nmethod() ) { 1191 nmethod* nm = (nmethod*)cb; 1192 // Clean inline caches pointing to both zombie and not_entrant methods 1193 if (!nm->is_in_use() || (nm->method()->code() != nm)) csc->set_to_clean(); 1194 } 1195 break; 1196 } 1197 } 1198 } 1199 } 1200 1201 void nmethod::verify_clean_inline_caches() { 1202 assert_locked_or_safepoint(CompiledIC_lock); 1203 1204 // If the method is not entrant or zombie then a JMP is plastered over the 1205 // first few bytes. If an oop in the old code was there, that oop 1206 // should not get GC'd. Skip the first few bytes of oops on 1207 // not-entrant methods. 1208 address low_boundary = verified_entry_point(); 1209 if (!is_in_use()) { 1210 low_boundary += NativeJump::instruction_size; 1211 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1212 // This means that the low_boundary is going to be a little too high. 1213 // This shouldn't matter, since oops of non-entrant methods are never used. 1214 // In fact, why are we bothering to look at oops in a non-entrant method?? 1215 } 1216 1217 ResourceMark rm; 1218 RelocIterator iter(this, low_boundary); 1219 while(iter.next()) { 1220 switch(iter.type()) { 1221 case relocInfo::virtual_call_type: 1222 case relocInfo::opt_virtual_call_type: { 1223 CompiledIC *ic = CompiledIC_at(&iter); 1224 // Ok, to lookup references to zombies here 1225 CodeBlob *cb = CodeCache::find_blob_unsafe(ic->ic_destination()); 1226 if( cb != NULL && cb->is_nmethod() ) { 1227 nmethod* nm = (nmethod*)cb; 1228 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1229 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1230 assert(ic->is_clean(), "IC should be clean"); 1231 } 1232 } 1233 break; 1234 } 1235 case relocInfo::static_call_type: { 1236 CompiledStaticCall *csc = compiledStaticCall_at(iter.reloc()); 1237 CodeBlob *cb = CodeCache::find_blob_unsafe(csc->destination()); 1238 if( cb != NULL && cb->is_nmethod() ) { 1239 nmethod* nm = (nmethod*)cb; 1240 // Verify that inline caches pointing to both zombie and not_entrant methods are clean 1241 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1242 assert(csc->is_clean(), "IC should be clean"); 1243 } 1244 } 1245 break; 1246 } 1247 } 1248 } 1249 } 1250 1251 int nmethod::verify_icholder_relocations() { 1252 int count = 0; 1253 1254 RelocIterator iter(this); 1255 while(iter.next()) { 1256 if (iter.type() == relocInfo::virtual_call_type) { 1257 if (CompiledIC::is_icholder_call_site(iter.virtual_call_reloc())) { 1258 CompiledIC *ic = CompiledIC_at(&iter); 1259 if (TraceCompiledIC) { 1260 tty->print("noticed icholder " INTPTR_FORMAT " ", p2i(ic->cached_icholder())); 1261 ic->print(); 1262 } 1263 assert(ic->cached_icholder() != NULL, "must be non-NULL"); 1264 count++; 1265 } 1266 } 1267 } 1268 1269 return count; 1270 } 1271 1272 // This is a private interface with the sweeper. 1273 void nmethod::mark_as_seen_on_stack() { 1274 assert(is_alive(), "Must be an alive method"); 1275 // Set the traversal mark to ensure that the sweeper does 2 1276 // cleaning passes before moving to zombie. 1277 set_stack_traversal_mark(NMethodSweeper::traversal_count()); 1278 } 1279 1280 // Tell if a non-entrant method can be converted to a zombie (i.e., 1281 // there are no activations on the stack, not in use by the VM, 1282 // and not in use by the ServiceThread) 1283 bool nmethod::can_not_entrant_be_converted() { 1284 assert(is_not_entrant(), "must be a non-entrant method"); 1285 1286 // Since the nmethod sweeper only does partial sweep the sweeper's traversal 1287 // count can be greater than the stack traversal count before it hits the 1288 // nmethod for the second time. 1289 return stack_traversal_mark()+1 < NMethodSweeper::traversal_count() && 1290 !is_locked_by_vm(); 1291 } 1292 1293 void nmethod::inc_decompile_count() { 1294 if (!is_compiled_by_c2()) return; 1295 // Could be gated by ProfileTraps, but do not bother... 1296 Method* m = method(); 1297 if (m == NULL) return; 1298 MethodData* mdo = m->method_data(); 1299 if (mdo == NULL) return; 1300 // There is a benign race here. See comments in methodData.hpp. 1301 mdo->inc_decompile_count(); 1302 } 1303 1304 void nmethod::increase_unloading_clock() { 1305 _global_unloading_clock++; 1306 if (_global_unloading_clock == 0) { 1307 // _nmethods are allocated with _unloading_clock == 0, 1308 // so 0 is never used as a clock value. 1309 _global_unloading_clock = 1; 1310 } 1311 } 1312 1313 void nmethod::set_unloading_clock(unsigned char unloading_clock) { 1314 OrderAccess::release_store((volatile jubyte*)&_unloading_clock, unloading_clock); 1315 } 1316 1317 unsigned char nmethod::unloading_clock() { 1318 return (unsigned char)OrderAccess::load_acquire((volatile jubyte*)&_unloading_clock); 1319 } 1320 1321 void nmethod::make_unloaded(BoolObjectClosure* is_alive, oop cause) { 1322 1323 post_compiled_method_unload(); 1324 1325 // Since this nmethod is being unloaded, make sure that dependencies 1326 // recorded in instanceKlasses get flushed and pass non-NULL closure to 1327 // indicate that this work is being done during a GC. 1328 assert(Universe::heap()->is_gc_active(), "should only be called during gc"); 1329 assert(is_alive != NULL, "Should be non-NULL"); 1330 // A non-NULL is_alive closure indicates that this is being called during GC. 1331 flush_dependencies(is_alive); 1332 1333 // Break cycle between nmethod & method 1334 if (TraceClassUnloading && WizardMode) { 1335 tty->print_cr("[Class unloading: Making nmethod " INTPTR_FORMAT 1336 " unloadable], Method*(" INTPTR_FORMAT 1337 "), cause(" INTPTR_FORMAT ")", 1338 this, (address)_method, (address)cause); 1339 if (!Universe::heap()->is_gc_active()) 1340 cause->klass()->print(); 1341 } 1342 // Unlink the osr method, so we do not look this up again 1343 if (is_osr_method()) { 1344 invalidate_osr_method(); 1345 } 1346 // If _method is already NULL the Method* is about to be unloaded, 1347 // so we don't have to break the cycle. Note that it is possible to 1348 // have the Method* live here, in case we unload the nmethod because 1349 // it is pointing to some oop (other than the Method*) being unloaded. 1350 if (_method != NULL) { 1351 // OSR methods point to the Method*, but the Method* does not 1352 // point back! 1353 if (_method->code() == this) { 1354 _method->clear_code(); // Break a cycle 1355 } 1356 _method = NULL; // Clear the method of this dead nmethod 1357 } 1358 // Make the class unloaded - i.e., change state and notify sweeper 1359 assert(SafepointSynchronize::is_at_safepoint(), "must be at safepoint"); 1360 if (is_in_use()) { 1361 // Transitioning directly from live to unloaded -- so 1362 // we need to force a cache clean-up; remember this 1363 // for later on. 1364 CodeCache::set_needs_cache_clean(true); 1365 } 1366 1367 // Unregister must be done before the state change 1368 Universe::heap()->unregister_nmethod(this); 1369 1370 _state = unloaded; 1371 1372 // Log the unloading. 1373 log_state_change(); 1374 1375 // The Method* is gone at this point 1376 assert(_method == NULL, "Tautology"); 1377 1378 set_osr_link(NULL); 1379 //set_scavenge_root_link(NULL); // done by prune_scavenge_root_nmethods 1380 NMethodSweeper::report_state_change(this); 1381 } 1382 1383 void nmethod::invalidate_osr_method() { 1384 assert(_entry_bci != InvocationEntryBci, "wrong kind of nmethod"); 1385 // Remove from list of active nmethods 1386 if (method() != NULL) 1387 method()->method_holder()->remove_osr_nmethod(this); 1388 // Set entry as invalid 1389 _entry_bci = InvalidOSREntryBci; 1390 } 1391 1392 void nmethod::log_state_change() const { 1393 if (LogCompilation) { 1394 if (xtty != NULL) { 1395 ttyLocker ttyl; // keep the following output all in one block 1396 if (_state == unloaded) { 1397 xtty->begin_elem("make_unloaded thread='" UINTX_FORMAT "'", 1398 os::current_thread_id()); 1399 } else { 1400 xtty->begin_elem("make_not_entrant thread='" UINTX_FORMAT "'%s", 1401 os::current_thread_id(), 1402 (_state == zombie ? " zombie='1'" : "")); 1403 } 1404 log_identity(xtty); 1405 xtty->stamp(); 1406 xtty->end_elem(); 1407 } 1408 } 1409 if (PrintCompilation && _state != unloaded) { 1410 print_on(tty, _state == zombie ? "made zombie" : "made not entrant"); 1411 } 1412 } 1413 1414 /** 1415 * Common functionality for both make_not_entrant and make_zombie 1416 */ 1417 bool nmethod::make_not_entrant_or_zombie(unsigned int state) { 1418 assert(state == zombie || state == not_entrant, "must be zombie or not_entrant"); 1419 assert(!is_zombie(), "should not already be a zombie"); 1420 1421 // Make sure neither the nmethod nor the method is flushed in case of a safepoint in code below. 1422 nmethodLocker nml(this); 1423 methodHandle the_method(method()); 1424 No_Safepoint_Verifier nsv; 1425 1426 // during patching, depending on the nmethod state we must notify the GC that 1427 // code has been unloaded, unregistering it. We cannot do this right while 1428 // holding the Patching_lock because we need to use the CodeCache_lock. This 1429 // would be prone to deadlocks. 1430 // This flag is used to remember whether we need to later lock and unregister. 1431 bool nmethod_needs_unregister = false; 1432 1433 { 1434 // invalidate osr nmethod before acquiring the patching lock since 1435 // they both acquire leaf locks and we don't want a deadlock. 1436 // This logic is equivalent to the logic below for patching the 1437 // verified entry point of regular methods. 1438 if (is_osr_method()) { 1439 // this effectively makes the osr nmethod not entrant 1440 invalidate_osr_method(); 1441 } 1442 1443 // Enter critical section. Does not block for safepoint. 1444 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); 1445 1446 if (_state == state) { 1447 // another thread already performed this transition so nothing 1448 // to do, but return false to indicate this. 1449 return false; 1450 } 1451 1452 // The caller can be calling the method statically or through an inline 1453 // cache call. 1454 if (!is_osr_method() && !is_not_entrant()) { 1455 NativeJump::patch_verified_entry(entry_point(), verified_entry_point(), 1456 SharedRuntime::get_handle_wrong_method_stub()); 1457 } 1458 1459 if (is_in_use()) { 1460 // It's a true state change, so mark the method as decompiled. 1461 // Do it only for transition from alive. 1462 inc_decompile_count(); 1463 } 1464 1465 // If the state is becoming a zombie, signal to unregister the nmethod with 1466 // the heap. 1467 // This nmethod may have already been unloaded during a full GC. 1468 if ((state == zombie) && !is_unloaded()) { 1469 nmethod_needs_unregister = true; 1470 } 1471 1472 // Must happen before state change. Otherwise we have a race condition in 1473 // nmethod::can_not_entrant_be_converted(). I.e., a method can immediately 1474 // transition its state from 'not_entrant' to 'zombie' without having to wait 1475 // for stack scanning. 1476 if (state == not_entrant) { 1477 mark_as_seen_on_stack(); 1478 OrderAccess::storestore(); 1479 } 1480 1481 // Change state 1482 _state = state; 1483 1484 // Log the transition once 1485 log_state_change(); 1486 1487 // Remove nmethod from method. 1488 // We need to check if both the _code and _from_compiled_code_entry_point 1489 // refer to this nmethod because there is a race in setting these two fields 1490 // in Method* as seen in bugid 4947125. 1491 // If the vep() points to the zombie nmethod, the memory for the nmethod 1492 // could be flushed and the compiler and vtable stubs could still call 1493 // through it. 1494 if (method() != NULL && (method()->code() == this || 1495 method()->from_compiled_entry() == verified_entry_point())) { 1496 HandleMark hm; 1497 method()->clear_code(); 1498 } 1499 } // leave critical region under Patching_lock 1500 1501 // When the nmethod becomes zombie it is no longer alive so the 1502 // dependencies must be flushed. nmethods in the not_entrant 1503 // state will be flushed later when the transition to zombie 1504 // happens or they get unloaded. 1505 if (state == zombie) { 1506 { 1507 // Flushing dependecies must be done before any possible 1508 // safepoint can sneak in, otherwise the oops used by the 1509 // dependency logic could have become stale. 1510 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag); 1511 if (nmethod_needs_unregister) { 1512 Universe::heap()->unregister_nmethod(this); 1513 } 1514 flush_dependencies(NULL); 1515 } 1516 1517 // zombie only - if a JVMTI agent has enabled the CompiledMethodUnload 1518 // event and it hasn't already been reported for this nmethod then 1519 // report it now. The event may have been reported earilier if the GC 1520 // marked it for unloading). JvmtiDeferredEventQueue support means 1521 // we no longer go to a safepoint here. 1522 post_compiled_method_unload(); 1523 1524 #ifdef ASSERT 1525 // It's no longer safe to access the oops section since zombie 1526 // nmethods aren't scanned for GC. 1527 _oops_are_stale = true; 1528 #endif 1529 // the Method may be reclaimed by class unloading now that the 1530 // nmethod is in zombie state 1531 set_method(NULL); 1532 } else { 1533 assert(state == not_entrant, "other cases may need to be handled differently"); 1534 } 1535 1536 if (TraceCreateZombies) { 1537 tty->print_cr("nmethod <" INTPTR_FORMAT "> code made %s", this, (state == not_entrant) ? "not entrant" : "zombie"); 1538 } 1539 1540 NMethodSweeper::report_state_change(this); 1541 return true; 1542 } 1543 1544 void nmethod::flush() { 1545 // Note that there are no valid oops in the nmethod anymore. 1546 assert(is_zombie() || (is_osr_method() && is_unloaded()), "must be a zombie method"); 1547 assert(is_marked_for_reclamation() || (is_osr_method() && is_unloaded()), "must be marked for reclamation"); 1548 1549 assert (!is_locked_by_vm(), "locked methods shouldn't be flushed"); 1550 assert_locked_or_safepoint(CodeCache_lock); 1551 1552 // completely deallocate this method 1553 Events::log(JavaThread::current(), "flushing nmethod " INTPTR_FORMAT, this); 1554 if (PrintMethodFlushing) { 1555 tty->print_cr("*flushing nmethod %3d/" INTPTR_FORMAT ". Live blobs:" UINT32_FORMAT "/Free CodeCache:" SIZE_FORMAT "Kb", 1556 _compile_id, this, CodeCache::nof_blobs(), CodeCache::unallocated_capacity()/1024); 1557 } 1558 1559 // We need to deallocate any ExceptionCache data. 1560 // Note that we do not need to grab the nmethod lock for this, it 1561 // better be thread safe if we're disposing of it! 1562 ExceptionCache* ec = exception_cache(); 1563 set_exception_cache(NULL); 1564 while(ec != NULL) { 1565 ExceptionCache* next = ec->next(); 1566 delete ec; 1567 ec = next; 1568 } 1569 1570 if (on_scavenge_root_list()) { 1571 CodeCache::drop_scavenge_root_nmethod(this); 1572 } 1573 1574 #ifdef SHARK 1575 ((SharkCompiler *) compiler())->free_compiled_method(insts_begin()); 1576 #endif // SHARK 1577 1578 ((CodeBlob*)(this))->flush(); 1579 1580 CodeCache::free(this); 1581 } 1582 1583 1584 // 1585 // Notify all classes this nmethod is dependent on that it is no 1586 // longer dependent. This should only be called in two situations. 1587 // First, when a nmethod transitions to a zombie all dependents need 1588 // to be clear. Since zombification happens at a safepoint there's no 1589 // synchronization issues. The second place is a little more tricky. 1590 // During phase 1 of mark sweep class unloading may happen and as a 1591 // result some nmethods may get unloaded. In this case the flushing 1592 // of dependencies must happen during phase 1 since after GC any 1593 // dependencies in the unloaded nmethod won't be updated, so 1594 // traversing the dependency information in unsafe. In that case this 1595 // function is called with a non-NULL argument and this function only 1596 // notifies instanceKlasses that are reachable 1597 1598 void nmethod::flush_dependencies(BoolObjectClosure* is_alive) { 1599 assert_locked_or_safepoint(CodeCache_lock); 1600 assert(Universe::heap()->is_gc_active() == (is_alive != NULL), 1601 "is_alive is non-NULL if and only if we are called during GC"); 1602 if (!has_flushed_dependencies()) { 1603 set_has_flushed_dependencies(); 1604 for (Dependencies::DepStream deps(this); deps.next(); ) { 1605 Klass* klass = deps.context_type(); 1606 if (klass == NULL) continue; // ignore things like evol_method 1607 1608 // During GC the is_alive closure is non-NULL, and is used to 1609 // determine liveness of dependees that need to be updated. 1610 if (is_alive == NULL || klass->is_loader_alive(is_alive)) { 1611 InstanceKlass::cast(klass)->remove_dependent_nmethod(this); 1612 } 1613 } 1614 } 1615 } 1616 1617 1618 // If this oop is not live, the nmethod can be unloaded. 1619 bool nmethod::can_unload(BoolObjectClosure* is_alive, oop* root, bool unloading_occurred) { 1620 assert(root != NULL, "just checking"); 1621 oop obj = *root; 1622 if (obj == NULL || is_alive->do_object_b(obj)) { 1623 return false; 1624 } 1625 1626 // If ScavengeRootsInCode is true, an nmethod might be unloaded 1627 // simply because one of its constant oops has gone dead. 1628 // No actual classes need to be unloaded in order for this to occur. 1629 assert(unloading_occurred || ScavengeRootsInCode, "Inconsistency in unloading"); 1630 make_unloaded(is_alive, obj); 1631 return true; 1632 } 1633 1634 // ------------------------------------------------------------------ 1635 // post_compiled_method_load_event 1636 // new method for install_code() path 1637 // Transfer information from compilation to jvmti 1638 void nmethod::post_compiled_method_load_event() { 1639 1640 Method* moop = method(); 1641 #ifndef USDT2 1642 HS_DTRACE_PROBE8(hotspot, compiled__method__load, 1643 moop->klass_name()->bytes(), 1644 moop->klass_name()->utf8_length(), 1645 moop->name()->bytes(), 1646 moop->name()->utf8_length(), 1647 moop->signature()->bytes(), 1648 moop->signature()->utf8_length(), 1649 insts_begin(), insts_size()); 1650 #else /* USDT2 */ 1651 HOTSPOT_COMPILED_METHOD_LOAD( 1652 (char *) moop->klass_name()->bytes(), 1653 moop->klass_name()->utf8_length(), 1654 (char *) moop->name()->bytes(), 1655 moop->name()->utf8_length(), 1656 (char *) moop->signature()->bytes(), 1657 moop->signature()->utf8_length(), 1658 insts_begin(), insts_size()); 1659 #endif /* USDT2 */ 1660 1661 if (JvmtiExport::should_post_compiled_method_load() || 1662 JvmtiExport::should_post_compiled_method_unload()) { 1663 get_and_cache_jmethod_id(); 1664 } 1665 1666 if (JvmtiExport::should_post_compiled_method_load()) { 1667 // Let the Service thread (which is a real Java thread) post the event 1668 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1669 JvmtiDeferredEventQueue::enqueue( 1670 JvmtiDeferredEvent::compiled_method_load_event(this)); 1671 } 1672 } 1673 1674 jmethodID nmethod::get_and_cache_jmethod_id() { 1675 if (_jmethod_id == NULL) { 1676 // Cache the jmethod_id since it can no longer be looked up once the 1677 // method itself has been marked for unloading. 1678 _jmethod_id = method()->jmethod_id(); 1679 } 1680 return _jmethod_id; 1681 } 1682 1683 void nmethod::post_compiled_method_unload() { 1684 if (unload_reported()) { 1685 // During unloading we transition to unloaded and then to zombie 1686 // and the unloading is reported during the first transition. 1687 return; 1688 } 1689 1690 assert(_method != NULL && !is_unloaded(), "just checking"); 1691 DTRACE_METHOD_UNLOAD_PROBE(method()); 1692 1693 // If a JVMTI agent has enabled the CompiledMethodUnload event then 1694 // post the event. Sometime later this nmethod will be made a zombie 1695 // by the sweeper but the Method* will not be valid at that point. 1696 // If the _jmethod_id is null then no load event was ever requested 1697 // so don't bother posting the unload. The main reason for this is 1698 // that the jmethodID is a weak reference to the Method* so if 1699 // it's being unloaded there's no way to look it up since the weak 1700 // ref will have been cleared. 1701 if (_jmethod_id != NULL && JvmtiExport::should_post_compiled_method_unload()) { 1702 assert(!unload_reported(), "already unloaded"); 1703 JvmtiDeferredEvent event = 1704 JvmtiDeferredEvent::compiled_method_unload_event(this, 1705 _jmethod_id, insts_begin()); 1706 if (SafepointSynchronize::is_at_safepoint()) { 1707 // Don't want to take the queueing lock. Add it as pending and 1708 // it will get enqueued later. 1709 JvmtiDeferredEventQueue::add_pending_event(event); 1710 } else { 1711 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag); 1712 JvmtiDeferredEventQueue::enqueue(event); 1713 } 1714 } 1715 1716 // The JVMTI CompiledMethodUnload event can be enabled or disabled at 1717 // any time. As the nmethod is being unloaded now we mark it has 1718 // having the unload event reported - this will ensure that we don't 1719 // attempt to report the event in the unlikely scenario where the 1720 // event is enabled at the time the nmethod is made a zombie. 1721 set_unload_reported(); 1722 } 1723 1724 void static clean_ic_if_metadata_is_dead(CompiledIC *ic, BoolObjectClosure *is_alive) { 1725 if (ic->is_icholder_call()) { 1726 // The only exception is compiledICHolder oops which may 1727 // yet be marked below. (We check this further below). 1728 CompiledICHolder* cichk_oop = ic->cached_icholder(); 1729 if (cichk_oop->holder_method()->method_holder()->is_loader_alive(is_alive) && 1730 cichk_oop->holder_klass()->is_loader_alive(is_alive)) { 1731 return; 1732 } 1733 } else { 1734 Metadata* ic_oop = ic->cached_metadata(); 1735 if (ic_oop != NULL) { 1736 if (ic_oop->is_klass()) { 1737 if (((Klass*)ic_oop)->is_loader_alive(is_alive)) { 1738 return; 1739 } 1740 } else if (ic_oop->is_method()) { 1741 if (((Method*)ic_oop)->method_holder()->is_loader_alive(is_alive)) { 1742 return; 1743 } 1744 } else { 1745 ShouldNotReachHere(); 1746 } 1747 } 1748 } 1749 1750 ic->set_to_clean(); 1751 } 1752 1753 // This is called at the end of the strong tracing/marking phase of a 1754 // GC to unload an nmethod if it contains otherwise unreachable 1755 // oops. 1756 1757 void nmethod::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) { 1758 // Make sure the oop's ready to receive visitors 1759 assert(!is_zombie() && !is_unloaded(), 1760 "should not call follow on zombie or unloaded nmethod"); 1761 1762 // If the method is not entrant then a JMP is plastered over the 1763 // first few bytes. If an oop in the old code was there, that oop 1764 // should not get GC'd. Skip the first few bytes of oops on 1765 // not-entrant methods. 1766 address low_boundary = verified_entry_point(); 1767 if (is_not_entrant()) { 1768 low_boundary += NativeJump::instruction_size; 1769 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1770 // (See comment above.) 1771 } 1772 1773 // The RedefineClasses() API can cause the class unloading invariant 1774 // to no longer be true. See jvmtiExport.hpp for details. 1775 // Also, leave a debugging breadcrumb in local flag. 1776 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1777 if (a_class_was_redefined) { 1778 // This set of the unloading_occurred flag is done before the 1779 // call to post_compiled_method_unload() so that the unloading 1780 // of this nmethod is reported. 1781 unloading_occurred = true; 1782 } 1783 1784 // Exception cache 1785 clean_exception_cache(is_alive); 1786 1787 // If class unloading occurred we first iterate over all inline caches and 1788 // clear ICs where the cached oop is referring to an unloaded klass or method. 1789 // The remaining live cached oops will be traversed in the relocInfo::oop_type 1790 // iteration below. 1791 if (unloading_occurred) { 1792 RelocIterator iter(this, low_boundary); 1793 while(iter.next()) { 1794 if (iter.type() == relocInfo::virtual_call_type) { 1795 CompiledIC *ic = CompiledIC_at(&iter); 1796 clean_ic_if_metadata_is_dead(ic, is_alive); 1797 } 1798 } 1799 } 1800 1801 // Compiled code 1802 { 1803 RelocIterator iter(this, low_boundary); 1804 while (iter.next()) { 1805 if (iter.type() == relocInfo::oop_type) { 1806 oop_Relocation* r = iter.oop_reloc(); 1807 // In this loop, we must only traverse those oops directly embedded in 1808 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 1809 assert(1 == (r->oop_is_immediate()) + 1810 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1811 "oop must be found in exactly one place"); 1812 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1813 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1814 return; 1815 } 1816 } 1817 } 1818 } 1819 } 1820 1821 1822 // Scopes 1823 for (oop* p = oops_begin(); p < oops_end(); p++) { 1824 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1825 if (can_unload(is_alive, p, unloading_occurred)) { 1826 return; 1827 } 1828 } 1829 1830 // Ensure that all metadata is still alive 1831 verify_metadata_loaders(low_boundary, is_alive); 1832 } 1833 1834 template <class CompiledICorStaticCall> 1835 static bool clean_if_nmethod_is_unloaded(CompiledICorStaticCall *ic, address addr, BoolObjectClosure *is_alive, nmethod* from) { 1836 // Ok, to lookup references to zombies here 1837 CodeBlob *cb = CodeCache::find_blob_unsafe(addr); 1838 if (cb != NULL && cb->is_nmethod()) { 1839 nmethod* nm = (nmethod*)cb; 1840 1841 if (nm->unloading_clock() != nmethod::global_unloading_clock()) { 1842 // The nmethod has not been processed yet. 1843 return true; 1844 } 1845 1846 // Clean inline caches pointing to both zombie and not_entrant methods 1847 if (!nm->is_in_use() || (nm->method()->code() != nm)) { 1848 ic->set_to_clean(); 1849 assert(ic->is_clean(), err_msg("nmethod " PTR_FORMAT "not clean %s", from, from->method()->name_and_sig_as_C_string())); 1850 } 1851 } 1852 1853 return false; 1854 } 1855 1856 static bool clean_if_nmethod_is_unloaded(CompiledIC *ic, BoolObjectClosure *is_alive, nmethod* from) { 1857 return clean_if_nmethod_is_unloaded(ic, ic->ic_destination(), is_alive, from); 1858 } 1859 1860 static bool clean_if_nmethod_is_unloaded(CompiledStaticCall *csc, BoolObjectClosure *is_alive, nmethod* from) { 1861 return clean_if_nmethod_is_unloaded(csc, csc->destination(), is_alive, from); 1862 } 1863 1864 bool nmethod::do_unloading_parallel(BoolObjectClosure* is_alive, bool unloading_occurred) { 1865 ResourceMark rm; 1866 1867 // Make sure the oop's ready to receive visitors 1868 assert(!is_zombie() && !is_unloaded(), 1869 "should not call follow on zombie or unloaded nmethod"); 1870 1871 // If the method is not entrant then a JMP is plastered over the 1872 // first few bytes. If an oop in the old code was there, that oop 1873 // should not get GC'd. Skip the first few bytes of oops on 1874 // not-entrant methods. 1875 address low_boundary = verified_entry_point(); 1876 if (is_not_entrant()) { 1877 low_boundary += NativeJump::instruction_size; 1878 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1879 // (See comment above.) 1880 } 1881 1882 // The RedefineClasses() API can cause the class unloading invariant 1883 // to no longer be true. See jvmtiExport.hpp for details. 1884 // Also, leave a debugging breadcrumb in local flag. 1885 bool a_class_was_redefined = JvmtiExport::has_redefined_a_class(); 1886 if (a_class_was_redefined) { 1887 // This set of the unloading_occurred flag is done before the 1888 // call to post_compiled_method_unload() so that the unloading 1889 // of this nmethod is reported. 1890 unloading_occurred = true; 1891 } 1892 1893 // Exception cache 1894 clean_exception_cache(is_alive); 1895 1896 bool is_unloaded = false; 1897 bool postponed = false; 1898 1899 RelocIterator iter(this, low_boundary); 1900 while(iter.next()) { 1901 1902 switch (iter.type()) { 1903 1904 case relocInfo::virtual_call_type: 1905 if (unloading_occurred) { 1906 // If class unloading occurred we first iterate over all inline caches and 1907 // clear ICs where the cached oop is referring to an unloaded klass or method. 1908 clean_ic_if_metadata_is_dead(CompiledIC_at(&iter), is_alive); 1909 } 1910 1911 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1912 break; 1913 1914 case relocInfo::opt_virtual_call_type: 1915 postponed |= clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1916 break; 1917 1918 case relocInfo::static_call_type: 1919 postponed |= clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1920 break; 1921 1922 case relocInfo::oop_type: 1923 if (!is_unloaded) { 1924 // Unload check 1925 oop_Relocation* r = iter.oop_reloc(); 1926 // Traverse those oops directly embedded in the code. 1927 // Other oops (oop_index>0) are seen as part of scopes_oops. 1928 assert(1 == (r->oop_is_immediate()) + 1929 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 1930 "oop must be found in exactly one place"); 1931 if (r->oop_is_immediate() && r->oop_value() != NULL) { 1932 if (can_unload(is_alive, r->oop_addr(), unloading_occurred)) { 1933 is_unloaded = true; 1934 } 1935 } 1936 } 1937 break; 1938 1939 } 1940 } 1941 1942 if (is_unloaded) { 1943 return postponed; 1944 } 1945 1946 // Scopes 1947 for (oop* p = oops_begin(); p < oops_end(); p++) { 1948 if (*p == Universe::non_oop_word()) continue; // skip non-oops 1949 if (can_unload(is_alive, p, unloading_occurred)) { 1950 is_unloaded = true; 1951 break; 1952 } 1953 } 1954 1955 if (is_unloaded) { 1956 return postponed; 1957 } 1958 1959 // Ensure that all metadata is still alive 1960 verify_metadata_loaders(low_boundary, is_alive); 1961 1962 return postponed; 1963 } 1964 1965 void nmethod::do_unloading_parallel_postponed(BoolObjectClosure* is_alive, bool unloading_occurred) { 1966 ResourceMark rm; 1967 1968 // Make sure the oop's ready to receive visitors 1969 assert(!is_zombie(), 1970 "should not call follow on zombie nmethod"); 1971 1972 // If the method is not entrant then a JMP is plastered over the 1973 // first few bytes. If an oop in the old code was there, that oop 1974 // should not get GC'd. Skip the first few bytes of oops on 1975 // not-entrant methods. 1976 address low_boundary = verified_entry_point(); 1977 if (is_not_entrant()) { 1978 low_boundary += NativeJump::instruction_size; 1979 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 1980 // (See comment above.) 1981 } 1982 1983 RelocIterator iter(this, low_boundary); 1984 while(iter.next()) { 1985 1986 switch (iter.type()) { 1987 1988 case relocInfo::virtual_call_type: 1989 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1990 break; 1991 1992 case relocInfo::opt_virtual_call_type: 1993 clean_if_nmethod_is_unloaded(CompiledIC_at(&iter), is_alive, this); 1994 break; 1995 1996 case relocInfo::static_call_type: 1997 clean_if_nmethod_is_unloaded(compiledStaticCall_at(iter.reloc()), is_alive, this); 1998 break; 1999 } 2000 } 2001 } 2002 2003 #ifdef ASSERT 2004 2005 class CheckClass : AllStatic { 2006 static BoolObjectClosure* _is_alive; 2007 2008 // Check class_loader is alive for this bit of metadata. 2009 static void check_class(Metadata* md) { 2010 Klass* klass = NULL; 2011 if (md->is_klass()) { 2012 klass = ((Klass*)md); 2013 } else if (md->is_method()) { 2014 klass = ((Method*)md)->method_holder(); 2015 } else if (md->is_methodData()) { 2016 klass = ((MethodData*)md)->method()->method_holder(); 2017 } else { 2018 md->print(); 2019 ShouldNotReachHere(); 2020 } 2021 assert(klass->is_loader_alive(_is_alive), "must be alive"); 2022 } 2023 public: 2024 static void do_check_class(BoolObjectClosure* is_alive, nmethod* nm) { 2025 assert(SafepointSynchronize::is_at_safepoint(), "this is only ok at safepoint"); 2026 _is_alive = is_alive; 2027 nm->metadata_do(check_class); 2028 } 2029 }; 2030 2031 // This is called during a safepoint so can use static data 2032 BoolObjectClosure* CheckClass::_is_alive = NULL; 2033 #endif // ASSERT 2034 2035 2036 // Processing of oop references should have been sufficient to keep 2037 // all strong references alive. Any weak references should have been 2038 // cleared as well. Visit all the metadata and ensure that it's 2039 // really alive. 2040 void nmethod::verify_metadata_loaders(address low_boundary, BoolObjectClosure* is_alive) { 2041 #ifdef ASSERT 2042 RelocIterator iter(this, low_boundary); 2043 while (iter.next()) { 2044 // static_stub_Relocations may have dangling references to 2045 // Method*s so trim them out here. Otherwise it looks like 2046 // compiled code is maintaining a link to dead metadata. 2047 address static_call_addr = NULL; 2048 if (iter.type() == relocInfo::opt_virtual_call_type) { 2049 CompiledIC* cic = CompiledIC_at(&iter); 2050 if (!cic->is_call_to_interpreted()) { 2051 static_call_addr = iter.addr(); 2052 } 2053 } else if (iter.type() == relocInfo::static_call_type) { 2054 CompiledStaticCall* csc = compiledStaticCall_at(iter.reloc()); 2055 if (!csc->is_call_to_interpreted()) { 2056 static_call_addr = iter.addr(); 2057 } 2058 } 2059 if (static_call_addr != NULL) { 2060 RelocIterator sciter(this, low_boundary); 2061 while (sciter.next()) { 2062 if (sciter.type() == relocInfo::static_stub_type && 2063 sciter.static_stub_reloc()->static_call() == static_call_addr) { 2064 sciter.static_stub_reloc()->clear_inline_cache(); 2065 } 2066 } 2067 } 2068 } 2069 // Check that the metadata embedded in the nmethod is alive 2070 CheckClass::do_check_class(is_alive, this); 2071 #endif 2072 } 2073 2074 2075 // Iterate over metadata calling this function. Used by RedefineClasses 2076 void nmethod::metadata_do(void f(Metadata*)) { 2077 address low_boundary = verified_entry_point(); 2078 if (is_not_entrant()) { 2079 low_boundary += NativeJump::instruction_size; 2080 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2081 // (See comment above.) 2082 } 2083 { 2084 // Visit all immediate references that are embedded in the instruction stream. 2085 RelocIterator iter(this, low_boundary); 2086 while (iter.next()) { 2087 if (iter.type() == relocInfo::metadata_type ) { 2088 metadata_Relocation* r = iter.metadata_reloc(); 2089 // In this lmetadata, we must only follow those metadatas directly embedded in 2090 // the code. Other metadatas (oop_index>0) are seen as part of 2091 // the metadata section below. 2092 assert(1 == (r->metadata_is_immediate()) + 2093 (r->metadata_addr() >= metadata_begin() && r->metadata_addr() < metadata_end()), 2094 "metadata must be found in exactly one place"); 2095 if (r->metadata_is_immediate() && r->metadata_value() != NULL) { 2096 Metadata* md = r->metadata_value(); 2097 f(md); 2098 } 2099 } else if (iter.type() == relocInfo::virtual_call_type) { 2100 // Check compiledIC holders associated with this nmethod 2101 CompiledIC *ic = CompiledIC_at(&iter); 2102 if (ic->is_icholder_call()) { 2103 CompiledICHolder* cichk = ic->cached_icholder(); 2104 f(cichk->holder_method()); 2105 f(cichk->holder_klass()); 2106 } else { 2107 Metadata* ic_oop = ic->cached_metadata(); 2108 if (ic_oop != NULL) { 2109 f(ic_oop); 2110 } 2111 } 2112 } 2113 } 2114 } 2115 2116 // Visit the metadata section 2117 for (Metadata** p = metadata_begin(); p < metadata_end(); p++) { 2118 if (*p == Universe::non_oop_word() || *p == NULL) continue; // skip non-oops 2119 Metadata* md = *p; 2120 f(md); 2121 } 2122 2123 // Call function Method*, not embedded in these other places. 2124 if (_method != NULL) f(_method); 2125 } 2126 2127 void nmethod::oops_do(OopClosure* f, bool allow_zombie) { 2128 // make sure the oops ready to receive visitors 2129 assert(allow_zombie || !is_zombie(), "should not call follow on zombie nmethod"); 2130 assert(!is_unloaded(), "should not call follow on unloaded nmethod"); 2131 2132 // If the method is not entrant or zombie then a JMP is plastered over the 2133 // first few bytes. If an oop in the old code was there, that oop 2134 // should not get GC'd. Skip the first few bytes of oops on 2135 // not-entrant methods. 2136 address low_boundary = verified_entry_point(); 2137 if (is_not_entrant()) { 2138 low_boundary += NativeJump::instruction_size; 2139 // %%% Note: On SPARC we patch only a 4-byte trap, not a full NativeJump. 2140 // (See comment above.) 2141 } 2142 2143 RelocIterator iter(this, low_boundary); 2144 2145 while (iter.next()) { 2146 if (iter.type() == relocInfo::oop_type ) { 2147 oop_Relocation* r = iter.oop_reloc(); 2148 // In this loop, we must only follow those oops directly embedded in 2149 // the code. Other oops (oop_index>0) are seen as part of scopes_oops. 2150 assert(1 == (r->oop_is_immediate()) + 2151 (r->oop_addr() >= oops_begin() && r->oop_addr() < oops_end()), 2152 "oop must be found in exactly one place"); 2153 if (r->oop_is_immediate() && r->oop_value() != NULL) { 2154 f->do_oop(r->oop_addr()); 2155 } 2156 } 2157 } 2158 2159 // Scopes 2160 // This includes oop constants not inlined in the code stream. 2161 for (oop* p = oops_begin(); p < oops_end(); p++) { 2162 if (*p == Universe::non_oop_word()) continue; // skip non-oops 2163 f->do_oop(p); 2164 } 2165 } 2166 2167 #define NMETHOD_SENTINEL ((nmethod*)badAddress) 2168 2169 nmethod* volatile nmethod::_oops_do_mark_nmethods; 2170 2171 // An nmethod is "marked" if its _mark_link is set non-null. 2172 // Even if it is the end of the linked list, it will have a non-null link value, 2173 // as long as it is on the list. 2174 // This code must be MP safe, because it is used from parallel GC passes. 2175 bool nmethod::test_set_oops_do_mark() { 2176 assert(nmethod::oops_do_marking_is_active(), "oops_do_marking_prologue must be called"); 2177 nmethod* observed_mark_link = _oops_do_mark_link; 2178 if (observed_mark_link == NULL) { 2179 // Claim this nmethod for this thread to mark. 2180 observed_mark_link = (nmethod*) 2181 Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_link, NULL); 2182 if (observed_mark_link == NULL) { 2183 2184 // Atomically append this nmethod (now claimed) to the head of the list: 2185 nmethod* observed_mark_nmethods = _oops_do_mark_nmethods; 2186 for (;;) { 2187 nmethod* required_mark_nmethods = observed_mark_nmethods; 2188 _oops_do_mark_link = required_mark_nmethods; 2189 observed_mark_nmethods = (nmethod*) 2190 Atomic::cmpxchg_ptr(this, &_oops_do_mark_nmethods, required_mark_nmethods); 2191 if (observed_mark_nmethods == required_mark_nmethods) 2192 break; 2193 } 2194 // Mark was clear when we first saw this guy. 2195 NOT_PRODUCT(if (TraceScavenge) print_on(tty, "oops_do, mark")); 2196 return false; 2197 } 2198 } 2199 // On fall through, another racing thread marked this nmethod before we did. 2200 return true; 2201 } 2202 2203 void nmethod::oops_do_marking_prologue() { 2204 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("[oops_do_marking_prologue")); 2205 assert(_oops_do_mark_nmethods == NULL, "must not call oops_do_marking_prologue twice in a row"); 2206 // We use cmpxchg_ptr instead of regular assignment here because the user 2207 // may fork a bunch of threads, and we need them all to see the same state. 2208 void* observed = Atomic::cmpxchg_ptr(NMETHOD_SENTINEL, &_oops_do_mark_nmethods, NULL); 2209 guarantee(observed == NULL, "no races in this sequential code"); 2210 } 2211 2212 void nmethod::oops_do_marking_epilogue() { 2213 assert(_oops_do_mark_nmethods != NULL, "must not call oops_do_marking_epilogue twice in a row"); 2214 nmethod* cur = _oops_do_mark_nmethods; 2215 while (cur != NMETHOD_SENTINEL) { 2216 assert(cur != NULL, "not NULL-terminated"); 2217 nmethod* next = cur->_oops_do_mark_link; 2218 cur->_oops_do_mark_link = NULL; 2219 cur->verify_oop_relocations(); 2220 NOT_PRODUCT(if (TraceScavenge) cur->print_on(tty, "oops_do, unmark")); 2221 cur = next; 2222 } 2223 void* required = _oops_do_mark_nmethods; 2224 void* observed = Atomic::cmpxchg_ptr(NULL, &_oops_do_mark_nmethods, required); 2225 guarantee(observed == required, "no races in this sequential code"); 2226 NOT_PRODUCT(if (TraceScavenge) tty->print_cr("oops_do_marking_epilogue]")); 2227 } 2228 2229 class DetectScavengeRoot: public OopClosure { 2230 bool _detected_scavenge_root; 2231 public: 2232 DetectScavengeRoot() : _detected_scavenge_root(false) 2233 { NOT_PRODUCT(_print_nm = NULL); } 2234 bool detected_scavenge_root() { return _detected_scavenge_root; } 2235 virtual void do_oop(oop* p) { 2236 if ((*p) != NULL && (*p)->is_scavengable()) { 2237 NOT_PRODUCT(maybe_print(p)); 2238 _detected_scavenge_root = true; 2239 } 2240 } 2241 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2242 2243 #ifndef PRODUCT 2244 nmethod* _print_nm; 2245 void maybe_print(oop* p) { 2246 if (_print_nm == NULL) return; 2247 if (!_detected_scavenge_root) _print_nm->print_on(tty, "new scavenge root"); 2248 tty->print_cr(""PTR_FORMAT"[offset=%d] detected scavengable oop "PTR_FORMAT" (found at "PTR_FORMAT")", 2249 _print_nm, (int)((intptr_t)p - (intptr_t)_print_nm), 2250 (void *)(*p), (intptr_t)p); 2251 (*p)->print(); 2252 } 2253 #endif //PRODUCT 2254 }; 2255 2256 bool nmethod::detect_scavenge_root_oops() { 2257 DetectScavengeRoot detect_scavenge_root; 2258 NOT_PRODUCT(if (TraceScavenge) detect_scavenge_root._print_nm = this); 2259 oops_do(&detect_scavenge_root); 2260 return detect_scavenge_root.detected_scavenge_root(); 2261 } 2262 2263 // Method that knows how to preserve outgoing arguments at call. This method must be 2264 // called with a frame corresponding to a Java invoke 2265 void nmethod::preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, OopClosure* f) { 2266 #ifndef SHARK 2267 if (!method()->is_native()) { 2268 SimpleScopeDesc ssd(this, fr.pc()); 2269 Bytecode_invoke call(ssd.method(), ssd.bci()); 2270 bool has_receiver = call.has_receiver(); 2271 bool has_appendix = call.has_appendix(); 2272 Symbol* signature = call.signature(); 2273 fr.oops_compiled_arguments_do(signature, has_receiver, has_appendix, reg_map, f); 2274 } 2275 #endif // !SHARK 2276 } 2277 2278 2279 oop nmethod::embeddedOop_at(u_char* p) { 2280 RelocIterator iter(this, p, p + 1); 2281 while (iter.next()) 2282 if (iter.type() == relocInfo::oop_type) { 2283 return iter.oop_reloc()->oop_value(); 2284 } 2285 return NULL; 2286 } 2287 2288 2289 inline bool includes(void* p, void* from, void* to) { 2290 return from <= p && p < to; 2291 } 2292 2293 2294 void nmethod::copy_scopes_pcs(PcDesc* pcs, int count) { 2295 assert(count >= 2, "must be sentinel values, at least"); 2296 2297 #ifdef ASSERT 2298 // must be sorted and unique; we do a binary search in find_pc_desc() 2299 int prev_offset = pcs[0].pc_offset(); 2300 assert(prev_offset == PcDesc::lower_offset_limit, 2301 "must start with a sentinel"); 2302 for (int i = 1; i < count; i++) { 2303 int this_offset = pcs[i].pc_offset(); 2304 assert(this_offset > prev_offset, "offsets must be sorted"); 2305 prev_offset = this_offset; 2306 } 2307 assert(prev_offset == PcDesc::upper_offset_limit, 2308 "must end with a sentinel"); 2309 #endif //ASSERT 2310 2311 // Search for MethodHandle invokes and tag the nmethod. 2312 for (int i = 0; i < count; i++) { 2313 if (pcs[i].is_method_handle_invoke()) { 2314 set_has_method_handle_invokes(true); 2315 break; 2316 } 2317 } 2318 assert(has_method_handle_invokes() == (_deoptimize_mh_offset != -1), "must have deopt mh handler"); 2319 2320 int size = count * sizeof(PcDesc); 2321 assert(scopes_pcs_size() >= size, "oob"); 2322 memcpy(scopes_pcs_begin(), pcs, size); 2323 2324 // Adjust the final sentinel downward. 2325 PcDesc* last_pc = &scopes_pcs_begin()[count-1]; 2326 assert(last_pc->pc_offset() == PcDesc::upper_offset_limit, "sanity"); 2327 last_pc->set_pc_offset(content_size() + 1); 2328 for (; last_pc + 1 < scopes_pcs_end(); last_pc += 1) { 2329 // Fill any rounding gaps with copies of the last record. 2330 last_pc[1] = last_pc[0]; 2331 } 2332 // The following assert could fail if sizeof(PcDesc) is not 2333 // an integral multiple of oopSize (the rounding term). 2334 // If it fails, change the logic to always allocate a multiple 2335 // of sizeof(PcDesc), and fill unused words with copies of *last_pc. 2336 assert(last_pc + 1 == scopes_pcs_end(), "must match exactly"); 2337 } 2338 2339 void nmethod::copy_scopes_data(u_char* buffer, int size) { 2340 assert(scopes_data_size() >= size, "oob"); 2341 memcpy(scopes_data_begin(), buffer, size); 2342 } 2343 2344 2345 #ifdef ASSERT 2346 static PcDesc* linear_search(nmethod* nm, int pc_offset, bool approximate) { 2347 PcDesc* lower = nm->scopes_pcs_begin(); 2348 PcDesc* upper = nm->scopes_pcs_end(); 2349 lower += 1; // exclude initial sentinel 2350 PcDesc* res = NULL; 2351 for (PcDesc* p = lower; p < upper; p++) { 2352 NOT_PRODUCT(--nmethod_stats.pc_desc_tests); // don't count this call to match_desc 2353 if (match_desc(p, pc_offset, approximate)) { 2354 if (res == NULL) 2355 res = p; 2356 else 2357 res = (PcDesc*) badAddress; 2358 } 2359 } 2360 return res; 2361 } 2362 #endif 2363 2364 2365 // Finds a PcDesc with real-pc equal to "pc" 2366 PcDesc* nmethod::find_pc_desc_internal(address pc, bool approximate) { 2367 address base_address = code_begin(); 2368 if ((pc < base_address) || 2369 (pc - base_address) >= (ptrdiff_t) PcDesc::upper_offset_limit) { 2370 return NULL; // PC is wildly out of range 2371 } 2372 int pc_offset = (int) (pc - base_address); 2373 2374 // Check the PcDesc cache if it contains the desired PcDesc 2375 // (This as an almost 100% hit rate.) 2376 PcDesc* res = _pc_desc_cache.find_pc_desc(pc_offset, approximate); 2377 if (res != NULL) { 2378 assert(res == linear_search(this, pc_offset, approximate), "cache ok"); 2379 return res; 2380 } 2381 2382 // Fallback algorithm: quasi-linear search for the PcDesc 2383 // Find the last pc_offset less than the given offset. 2384 // The successor must be the required match, if there is a match at all. 2385 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 2386 PcDesc* lower = scopes_pcs_begin(); 2387 PcDesc* upper = scopes_pcs_end(); 2388 upper -= 1; // exclude final sentinel 2389 if (lower >= upper) return NULL; // native method; no PcDescs at all 2390 2391 #define assert_LU_OK \ 2392 /* invariant on lower..upper during the following search: */ \ 2393 assert(lower->pc_offset() < pc_offset, "sanity"); \ 2394 assert(upper->pc_offset() >= pc_offset, "sanity") 2395 assert_LU_OK; 2396 2397 // Use the last successful return as a split point. 2398 PcDesc* mid = _pc_desc_cache.last_pc_desc(); 2399 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2400 if (mid->pc_offset() < pc_offset) { 2401 lower = mid; 2402 } else { 2403 upper = mid; 2404 } 2405 2406 // Take giant steps at first (4096, then 256, then 16, then 1) 2407 const int LOG2_RADIX = 4 /*smaller steps in debug mode:*/ debug_only(-1); 2408 const int RADIX = (1 << LOG2_RADIX); 2409 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 2410 while ((mid = lower + step) < upper) { 2411 assert_LU_OK; 2412 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2413 if (mid->pc_offset() < pc_offset) { 2414 lower = mid; 2415 } else { 2416 upper = mid; 2417 break; 2418 } 2419 } 2420 assert_LU_OK; 2421 } 2422 2423 // Sneak up on the value with a linear search of length ~16. 2424 while (true) { 2425 assert_LU_OK; 2426 mid = lower + 1; 2427 NOT_PRODUCT(++nmethod_stats.pc_desc_searches); 2428 if (mid->pc_offset() < pc_offset) { 2429 lower = mid; 2430 } else { 2431 upper = mid; 2432 break; 2433 } 2434 } 2435 #undef assert_LU_OK 2436 2437 if (match_desc(upper, pc_offset, approximate)) { 2438 assert(upper == linear_search(this, pc_offset, approximate), "search ok"); 2439 _pc_desc_cache.add_pc_desc(upper); 2440 return upper; 2441 } else { 2442 assert(NULL == linear_search(this, pc_offset, approximate), "search ok"); 2443 return NULL; 2444 } 2445 } 2446 2447 2448 bool nmethod::check_all_dependencies() { 2449 bool found_check = false; 2450 // wholesale check of all dependencies 2451 for (Dependencies::DepStream deps(this); deps.next(); ) { 2452 if (deps.check_dependency() != NULL) { 2453 found_check = true; 2454 NOT_DEBUG(break); 2455 } 2456 } 2457 return found_check; // tell caller if we found anything 2458 } 2459 2460 bool nmethod::check_dependency_on(DepChange& changes) { 2461 // What has happened: 2462 // 1) a new class dependee has been added 2463 // 2) dependee and all its super classes have been marked 2464 bool found_check = false; // set true if we are upset 2465 for (Dependencies::DepStream deps(this); deps.next(); ) { 2466 // Evaluate only relevant dependencies. 2467 if (deps.spot_check_dependency_at(changes) != NULL) { 2468 found_check = true; 2469 NOT_DEBUG(break); 2470 } 2471 } 2472 return found_check; 2473 } 2474 2475 bool nmethod::is_evol_dependent_on(Klass* dependee) { 2476 InstanceKlass *dependee_ik = InstanceKlass::cast(dependee); 2477 Array<Method*>* dependee_methods = dependee_ik->methods(); 2478 for (Dependencies::DepStream deps(this); deps.next(); ) { 2479 if (deps.type() == Dependencies::evol_method) { 2480 Method* method = deps.method_argument(0); 2481 for (int j = 0; j < dependee_methods->length(); j++) { 2482 if (dependee_methods->at(j) == method) { 2483 // RC_TRACE macro has an embedded ResourceMark 2484 RC_TRACE(0x01000000, 2485 ("Found evol dependency of nmethod %s.%s(%s) compile_id=%d on method %s.%s(%s)", 2486 _method->method_holder()->external_name(), 2487 _method->name()->as_C_string(), 2488 _method->signature()->as_C_string(), compile_id(), 2489 method->method_holder()->external_name(), 2490 method->name()->as_C_string(), 2491 method->signature()->as_C_string())); 2492 if (TraceDependencies || LogCompilation) 2493 deps.log_dependency(dependee); 2494 return true; 2495 } 2496 } 2497 } 2498 } 2499 return false; 2500 } 2501 2502 // Called from mark_for_deoptimization, when dependee is invalidated. 2503 bool nmethod::is_dependent_on_method(Method* dependee) { 2504 for (Dependencies::DepStream deps(this); deps.next(); ) { 2505 if (deps.type() != Dependencies::evol_method) 2506 continue; 2507 Method* method = deps.method_argument(0); 2508 if (method == dependee) return true; 2509 } 2510 return false; 2511 } 2512 2513 2514 bool nmethod::is_patchable_at(address instr_addr) { 2515 assert(insts_contains(instr_addr), "wrong nmethod used"); 2516 if (is_zombie()) { 2517 // a zombie may never be patched 2518 return false; 2519 } 2520 return true; 2521 } 2522 2523 2524 address nmethod::continuation_for_implicit_exception(address pc) { 2525 // Exception happened outside inline-cache check code => we are inside 2526 // an active nmethod => use cpc to determine a return address 2527 int exception_offset = pc - code_begin(); 2528 int cont_offset = ImplicitExceptionTable(this).at( exception_offset ); 2529 #ifdef ASSERT 2530 if (cont_offset == 0) { 2531 Thread* thread = ThreadLocalStorage::get_thread_slow(); 2532 ResetNoHandleMark rnm; // Might be called from LEAF/QUICK ENTRY 2533 HandleMark hm(thread); 2534 ResourceMark rm(thread); 2535 CodeBlob* cb = CodeCache::find_blob(pc); 2536 assert(cb != NULL && cb == this, ""); 2537 tty->print_cr("implicit exception happened at " INTPTR_FORMAT, pc); 2538 print(); 2539 method()->print_codes(); 2540 print_code(); 2541 print_pcs(); 2542 } 2543 #endif 2544 if (cont_offset == 0) { 2545 // Let the normal error handling report the exception 2546 return NULL; 2547 } 2548 return code_begin() + cont_offset; 2549 } 2550 2551 2552 2553 void nmethod_init() { 2554 // make sure you didn't forget to adjust the filler fields 2555 assert(sizeof(nmethod) % oopSize == 0, "nmethod size must be multiple of a word"); 2556 } 2557 2558 2559 //------------------------------------------------------------------------------------------- 2560 2561 2562 // QQQ might we make this work from a frame?? 2563 nmethodLocker::nmethodLocker(address pc) { 2564 CodeBlob* cb = CodeCache::find_blob(pc); 2565 guarantee(cb != NULL && cb->is_nmethod(), "bad pc for a nmethod found"); 2566 _nm = (nmethod*)cb; 2567 lock_nmethod(_nm); 2568 } 2569 2570 // Only JvmtiDeferredEvent::compiled_method_unload_event() 2571 // should pass zombie_ok == true. 2572 void nmethodLocker::lock_nmethod(nmethod* nm, bool zombie_ok) { 2573 if (nm == NULL) return; 2574 Atomic::inc(&nm->_lock_count); 2575 guarantee(zombie_ok || !nm->is_zombie(), "cannot lock a zombie method"); 2576 } 2577 2578 void nmethodLocker::unlock_nmethod(nmethod* nm) { 2579 if (nm == NULL) return; 2580 Atomic::dec(&nm->_lock_count); 2581 guarantee(nm->_lock_count >= 0, "unmatched nmethod lock/unlock"); 2582 } 2583 2584 2585 // ----------------------------------------------------------------------------- 2586 // nmethod::get_deopt_original_pc 2587 // 2588 // Return the original PC for the given PC if: 2589 // (a) the given PC belongs to a nmethod and 2590 // (b) it is a deopt PC 2591 address nmethod::get_deopt_original_pc(const frame* fr) { 2592 if (fr->cb() == NULL) return NULL; 2593 2594 nmethod* nm = fr->cb()->as_nmethod_or_null(); 2595 if (nm != NULL && nm->is_deopt_pc(fr->pc())) 2596 return nm->get_original_pc(fr); 2597 2598 return NULL; 2599 } 2600 2601 2602 // ----------------------------------------------------------------------------- 2603 // MethodHandle 2604 2605 bool nmethod::is_method_handle_return(address return_pc) { 2606 if (!has_method_handle_invokes()) return false; 2607 PcDesc* pd = pc_desc_at(return_pc); 2608 if (pd == NULL) 2609 return false; 2610 return pd->is_method_handle_invoke(); 2611 } 2612 2613 2614 // ----------------------------------------------------------------------------- 2615 // Verification 2616 2617 class VerifyOopsClosure: public OopClosure { 2618 nmethod* _nm; 2619 bool _ok; 2620 public: 2621 VerifyOopsClosure(nmethod* nm) : _nm(nm), _ok(true) { } 2622 bool ok() { return _ok; } 2623 virtual void do_oop(oop* p) { 2624 if ((*p) == NULL || (*p)->is_oop()) return; 2625 if (_ok) { 2626 _nm->print_nmethod(true); 2627 _ok = false; 2628 } 2629 tty->print_cr("*** non-oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2630 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2631 } 2632 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2633 }; 2634 2635 void nmethod::verify() { 2636 2637 // Hmm. OSR methods can be deopted but not marked as zombie or not_entrant 2638 // seems odd. 2639 2640 if( is_zombie() || is_not_entrant() ) 2641 return; 2642 2643 // Make sure all the entry points are correctly aligned for patching. 2644 NativeJump::check_verified_entry_alignment(entry_point(), verified_entry_point()); 2645 2646 // assert(method()->is_oop(), "must be valid"); 2647 2648 ResourceMark rm; 2649 2650 if (!CodeCache::contains(this)) { 2651 fatal(err_msg("nmethod at " INTPTR_FORMAT " not in zone", this)); 2652 } 2653 2654 if(is_native_method() ) 2655 return; 2656 2657 nmethod* nm = CodeCache::find_nmethod(verified_entry_point()); 2658 if (nm != this) { 2659 fatal(err_msg("findNMethod did not find this nmethod (" INTPTR_FORMAT ")", 2660 this)); 2661 } 2662 2663 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2664 if (! p->verify(this)) { 2665 tty->print_cr("\t\tin nmethod at " INTPTR_FORMAT " (pcs)", this); 2666 } 2667 } 2668 2669 VerifyOopsClosure voc(this); 2670 oops_do(&voc); 2671 assert(voc.ok(), "embedded oops must be OK"); 2672 verify_scavenge_root_oops(); 2673 2674 verify_scopes(); 2675 } 2676 2677 2678 void nmethod::verify_interrupt_point(address call_site) { 2679 // Verify IC only when nmethod installation is finished. 2680 bool is_installed = (method()->code() == this) // nmethod is in state 'in_use' and installed 2681 || !this->is_in_use(); // nmethod is installed, but not in 'in_use' state 2682 if (is_installed) { 2683 Thread *cur = Thread::current(); 2684 if (CompiledIC_lock->owner() == cur || 2685 ((cur->is_VM_thread() || cur->is_ConcurrentGC_thread()) && 2686 SafepointSynchronize::is_at_safepoint())) { 2687 CompiledIC_at(this, call_site); 2688 CHECK_UNHANDLED_OOPS_ONLY(Thread::current()->clear_unhandled_oops()); 2689 } else { 2690 MutexLocker ml_verify (CompiledIC_lock); 2691 CompiledIC_at(this, call_site); 2692 } 2693 } 2694 2695 PcDesc* pd = pc_desc_at(nativeCall_at(call_site)->return_address()); 2696 assert(pd != NULL, "PcDesc must exist"); 2697 for (ScopeDesc* sd = new ScopeDesc(this, pd->scope_decode_offset(), 2698 pd->obj_decode_offset(), pd->should_reexecute(), 2699 pd->return_oop()); 2700 !sd->is_top(); sd = sd->sender()) { 2701 sd->verify(); 2702 } 2703 } 2704 2705 void nmethod::verify_scopes() { 2706 if( !method() ) return; // Runtime stubs have no scope 2707 if (method()->is_native()) return; // Ignore stub methods. 2708 // iterate through all interrupt point 2709 // and verify the debug information is valid. 2710 RelocIterator iter((nmethod*)this); 2711 while (iter.next()) { 2712 address stub = NULL; 2713 switch (iter.type()) { 2714 case relocInfo::virtual_call_type: 2715 verify_interrupt_point(iter.addr()); 2716 break; 2717 case relocInfo::opt_virtual_call_type: 2718 stub = iter.opt_virtual_call_reloc()->static_stub(); 2719 verify_interrupt_point(iter.addr()); 2720 break; 2721 case relocInfo::static_call_type: 2722 stub = iter.static_call_reloc()->static_stub(); 2723 //verify_interrupt_point(iter.addr()); 2724 break; 2725 case relocInfo::runtime_call_type: 2726 address destination = iter.reloc()->value(); 2727 // Right now there is no way to find out which entries support 2728 // an interrupt point. It would be nice if we had this 2729 // information in a table. 2730 break; 2731 } 2732 assert(stub == NULL || stub_contains(stub), "static call stub outside stub section"); 2733 } 2734 } 2735 2736 2737 // ----------------------------------------------------------------------------- 2738 // Non-product code 2739 #ifndef PRODUCT 2740 2741 class DebugScavengeRoot: public OopClosure { 2742 nmethod* _nm; 2743 bool _ok; 2744 public: 2745 DebugScavengeRoot(nmethod* nm) : _nm(nm), _ok(true) { } 2746 bool ok() { return _ok; } 2747 virtual void do_oop(oop* p) { 2748 if ((*p) == NULL || !(*p)->is_scavengable()) return; 2749 if (_ok) { 2750 _nm->print_nmethod(true); 2751 _ok = false; 2752 } 2753 tty->print_cr("*** scavengable oop "PTR_FORMAT" found at "PTR_FORMAT" (offset %d)", 2754 (void *)(*p), (intptr_t)p, (int)((intptr_t)p - (intptr_t)_nm)); 2755 (*p)->print(); 2756 } 2757 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } 2758 }; 2759 2760 void nmethod::verify_scavenge_root_oops() { 2761 if (UseG1GC) { 2762 return; 2763 } 2764 2765 if (!on_scavenge_root_list()) { 2766 // Actually look inside, to verify the claim that it's clean. 2767 DebugScavengeRoot debug_scavenge_root(this); 2768 oops_do(&debug_scavenge_root); 2769 if (!debug_scavenge_root.ok()) 2770 fatal("found an unadvertised bad scavengable oop in the code cache"); 2771 } 2772 assert(scavenge_root_not_marked(), ""); 2773 } 2774 2775 #endif // PRODUCT 2776 2777 // Printing operations 2778 2779 void nmethod::print() const { 2780 ResourceMark rm; 2781 ttyLocker ttyl; // keep the following output all in one block 2782 2783 tty->print("Compiled method "); 2784 2785 if (is_compiled_by_c1()) { 2786 tty->print("(c1) "); 2787 } else if (is_compiled_by_c2()) { 2788 tty->print("(c2) "); 2789 } else if (is_compiled_by_shark()) { 2790 tty->print("(shark) "); 2791 } else { 2792 tty->print("(nm) "); 2793 } 2794 2795 print_on(tty, NULL); 2796 2797 if (WizardMode) { 2798 tty->print("((nmethod*) "INTPTR_FORMAT ") ", this); 2799 tty->print(" for method " INTPTR_FORMAT , (address)method()); 2800 tty->print(" { "); 2801 if (is_in_use()) tty->print("in_use "); 2802 if (is_not_entrant()) tty->print("not_entrant "); 2803 if (is_zombie()) tty->print("zombie "); 2804 if (is_unloaded()) tty->print("unloaded "); 2805 if (on_scavenge_root_list()) tty->print("scavenge_root "); 2806 tty->print_cr("}:"); 2807 } 2808 if (size () > 0) tty->print_cr(" total in heap [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2809 (address)this, 2810 (address)this + size(), 2811 size()); 2812 if (relocation_size () > 0) tty->print_cr(" relocation [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2813 relocation_begin(), 2814 relocation_end(), 2815 relocation_size()); 2816 if (consts_size () > 0) tty->print_cr(" constants [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2817 consts_begin(), 2818 consts_end(), 2819 consts_size()); 2820 if (insts_size () > 0) tty->print_cr(" main code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2821 insts_begin(), 2822 insts_end(), 2823 insts_size()); 2824 if (stub_size () > 0) tty->print_cr(" stub code [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2825 stub_begin(), 2826 stub_end(), 2827 stub_size()); 2828 if (oops_size () > 0) tty->print_cr(" oops [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2829 oops_begin(), 2830 oops_end(), 2831 oops_size()); 2832 if (metadata_size () > 0) tty->print_cr(" metadata [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2833 metadata_begin(), 2834 metadata_end(), 2835 metadata_size()); 2836 if (scopes_data_size () > 0) tty->print_cr(" scopes data [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2837 scopes_data_begin(), 2838 scopes_data_end(), 2839 scopes_data_size()); 2840 if (scopes_pcs_size () > 0) tty->print_cr(" scopes pcs [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2841 scopes_pcs_begin(), 2842 scopes_pcs_end(), 2843 scopes_pcs_size()); 2844 if (dependencies_size () > 0) tty->print_cr(" dependencies [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2845 dependencies_begin(), 2846 dependencies_end(), 2847 dependencies_size()); 2848 if (handler_table_size() > 0) tty->print_cr(" handler table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2849 handler_table_begin(), 2850 handler_table_end(), 2851 handler_table_size()); 2852 if (nul_chk_table_size() > 0) tty->print_cr(" nul chk table [" INTPTR_FORMAT "," INTPTR_FORMAT "] = %d", 2853 nul_chk_table_begin(), 2854 nul_chk_table_end(), 2855 nul_chk_table_size()); 2856 } 2857 2858 void nmethod::print_code() { 2859 HandleMark hm; 2860 ResourceMark m; 2861 Disassembler::decode(this); 2862 } 2863 2864 2865 #ifndef PRODUCT 2866 2867 void nmethod::print_scopes() { 2868 // Find the first pc desc for all scopes in the code and print it. 2869 ResourceMark rm; 2870 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2871 if (p->scope_decode_offset() == DebugInformationRecorder::serialized_null) 2872 continue; 2873 2874 ScopeDesc* sd = scope_desc_at(p->real_pc(this)); 2875 sd->print_on(tty, p); 2876 } 2877 } 2878 2879 void nmethod::print_dependencies() { 2880 ResourceMark rm; 2881 ttyLocker ttyl; // keep the following output all in one block 2882 tty->print_cr("Dependencies:"); 2883 for (Dependencies::DepStream deps(this); deps.next(); ) { 2884 deps.print_dependency(); 2885 Klass* ctxk = deps.context_type(); 2886 if (ctxk != NULL) { 2887 if (ctxk->oop_is_instance() && ((InstanceKlass*)ctxk)->is_dependent_nmethod(this)) { 2888 tty->print_cr(" [nmethod<=klass]%s", ctxk->external_name()); 2889 } 2890 } 2891 deps.log_dependency(); // put it into the xml log also 2892 } 2893 } 2894 2895 2896 void nmethod::print_relocations() { 2897 ResourceMark m; // in case methods get printed via the debugger 2898 tty->print_cr("relocations:"); 2899 RelocIterator iter(this); 2900 iter.print(); 2901 if (UseRelocIndex) { 2902 jint* index_end = (jint*)relocation_end() - 1; 2903 jint index_size = *index_end; 2904 jint* index_start = (jint*)( (address)index_end - index_size ); 2905 tty->print_cr(" index @" INTPTR_FORMAT ": index_size=%d", index_start, index_size); 2906 if (index_size > 0) { 2907 jint* ip; 2908 for (ip = index_start; ip+2 <= index_end; ip += 2) 2909 tty->print_cr(" (%d %d) addr=" INTPTR_FORMAT " @" INTPTR_FORMAT, 2910 ip[0], 2911 ip[1], 2912 header_end()+ip[0], 2913 relocation_begin()-1+ip[1]); 2914 for (; ip < index_end; ip++) 2915 tty->print_cr(" (%d ?)", ip[0]); 2916 tty->print_cr(" @" INTPTR_FORMAT ": index_size=%d", ip, *ip); 2917 ip++; 2918 tty->print_cr("reloc_end @" INTPTR_FORMAT ":", ip); 2919 } 2920 } 2921 } 2922 2923 2924 void nmethod::print_pcs() { 2925 ResourceMark m; // in case methods get printed via debugger 2926 tty->print_cr("pc-bytecode offsets:"); 2927 for (PcDesc* p = scopes_pcs_begin(); p < scopes_pcs_end(); p++) { 2928 p->print(this); 2929 } 2930 } 2931 2932 #endif // PRODUCT 2933 2934 const char* nmethod::reloc_string_for(u_char* begin, u_char* end) { 2935 RelocIterator iter(this, begin, end); 2936 bool have_one = false; 2937 while (iter.next()) { 2938 have_one = true; 2939 switch (iter.type()) { 2940 case relocInfo::none: return "no_reloc"; 2941 case relocInfo::oop_type: { 2942 stringStream st; 2943 oop_Relocation* r = iter.oop_reloc(); 2944 oop obj = r->oop_value(); 2945 st.print("oop("); 2946 if (obj == NULL) st.print("NULL"); 2947 else obj->print_value_on(&st); 2948 st.print(")"); 2949 return st.as_string(); 2950 } 2951 case relocInfo::metadata_type: { 2952 stringStream st; 2953 metadata_Relocation* r = iter.metadata_reloc(); 2954 Metadata* obj = r->metadata_value(); 2955 st.print("metadata("); 2956 if (obj == NULL) st.print("NULL"); 2957 else obj->print_value_on(&st); 2958 st.print(")"); 2959 return st.as_string(); 2960 } 2961 case relocInfo::virtual_call_type: return "virtual_call"; 2962 case relocInfo::opt_virtual_call_type: return "optimized virtual_call"; 2963 case relocInfo::static_call_type: return "static_call"; 2964 case relocInfo::static_stub_type: return "static_stub"; 2965 case relocInfo::runtime_call_type: return "runtime_call"; 2966 case relocInfo::external_word_type: return "external_word"; 2967 case relocInfo::internal_word_type: return "internal_word"; 2968 case relocInfo::section_word_type: return "section_word"; 2969 case relocInfo::poll_type: return "poll"; 2970 case relocInfo::poll_return_type: return "poll_return"; 2971 case relocInfo::type_mask: return "type_bit_mask"; 2972 } 2973 } 2974 return have_one ? "other" : NULL; 2975 } 2976 2977 // Return a the last scope in (begin..end] 2978 ScopeDesc* nmethod::scope_desc_in(address begin, address end) { 2979 PcDesc* p = pc_desc_near(begin+1); 2980 if (p != NULL && p->real_pc(this) <= end) { 2981 return new ScopeDesc(this, p->scope_decode_offset(), 2982 p->obj_decode_offset(), p->should_reexecute(), 2983 p->return_oop()); 2984 } 2985 return NULL; 2986 } 2987 2988 void nmethod::print_nmethod_labels(outputStream* stream, address block_begin) const { 2989 if (block_begin == entry_point()) stream->print_cr("[Entry Point]"); 2990 if (block_begin == verified_entry_point()) stream->print_cr("[Verified Entry Point]"); 2991 if (block_begin == exception_begin()) stream->print_cr("[Exception Handler]"); 2992 if (block_begin == stub_begin()) stream->print_cr("[Stub Code]"); 2993 if (block_begin == deopt_handler_begin()) stream->print_cr("[Deopt Handler Code]"); 2994 2995 if (has_method_handle_invokes()) 2996 if (block_begin == deopt_mh_handler_begin()) stream->print_cr("[Deopt MH Handler Code]"); 2997 2998 if (block_begin == consts_begin()) stream->print_cr("[Constants]"); 2999 3000 if (block_begin == entry_point()) { 3001 methodHandle m = method(); 3002 if (m.not_null()) { 3003 stream->print(" # "); 3004 m->print_value_on(stream); 3005 stream->cr(); 3006 } 3007 if (m.not_null() && !is_osr_method()) { 3008 ResourceMark rm; 3009 int sizeargs = m->size_of_parameters(); 3010 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs); 3011 VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs); 3012 { 3013 int sig_index = 0; 3014 if (!m->is_static()) 3015 sig_bt[sig_index++] = T_OBJECT; // 'this' 3016 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ss.next()) { 3017 BasicType t = ss.type(); 3018 sig_bt[sig_index++] = t; 3019 if (type2size[t] == 2) { 3020 sig_bt[sig_index++] = T_VOID; 3021 } else { 3022 assert(type2size[t] == 1, "size is 1 or 2"); 3023 } 3024 } 3025 assert(sig_index == sizeargs, ""); 3026 } 3027 const char* spname = "sp"; // make arch-specific? 3028 intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, false); 3029 int stack_slot_offset = this->frame_size() * wordSize; 3030 int tab1 = 14, tab2 = 24; 3031 int sig_index = 0; 3032 int arg_index = (m->is_static() ? 0 : -1); 3033 bool did_old_sp = false; 3034 for (SignatureStream ss(m->signature()); !ss.at_return_type(); ) { 3035 bool at_this = (arg_index == -1); 3036 bool at_old_sp = false; 3037 BasicType t = (at_this ? T_OBJECT : ss.type()); 3038 assert(t == sig_bt[sig_index], "sigs in sync"); 3039 if (at_this) 3040 stream->print(" # this: "); 3041 else 3042 stream->print(" # parm%d: ", arg_index); 3043 stream->move_to(tab1); 3044 VMReg fst = regs[sig_index].first(); 3045 VMReg snd = regs[sig_index].second(); 3046 if (fst->is_reg()) { 3047 stream->print("%s", fst->name()); 3048 if (snd->is_valid()) { 3049 stream->print(":%s", snd->name()); 3050 } 3051 } else if (fst->is_stack()) { 3052 int offset = fst->reg2stack() * VMRegImpl::stack_slot_size + stack_slot_offset; 3053 if (offset == stack_slot_offset) at_old_sp = true; 3054 stream->print("[%s+0x%x]", spname, offset); 3055 } else { 3056 stream->print("reg%d:%d??", (int)(intptr_t)fst, (int)(intptr_t)snd); 3057 } 3058 stream->print(" "); 3059 stream->move_to(tab2); 3060 stream->print("= "); 3061 if (at_this) { 3062 m->method_holder()->print_value_on(stream); 3063 } else { 3064 bool did_name = false; 3065 if (!at_this && ss.is_object()) { 3066 Symbol* name = ss.as_symbol_or_null(); 3067 if (name != NULL) { 3068 name->print_value_on(stream); 3069 did_name = true; 3070 } 3071 } 3072 if (!did_name) 3073 stream->print("%s", type2name(t)); 3074 } 3075 if (at_old_sp) { 3076 stream->print(" (%s of caller)", spname); 3077 did_old_sp = true; 3078 } 3079 stream->cr(); 3080 sig_index += type2size[t]; 3081 arg_index += 1; 3082 if (!at_this) ss.next(); 3083 } 3084 if (!did_old_sp) { 3085 stream->print(" # "); 3086 stream->move_to(tab1); 3087 stream->print("[%s+0x%x]", spname, stack_slot_offset); 3088 stream->print(" (%s of caller)", spname); 3089 stream->cr(); 3090 } 3091 } 3092 } 3093 } 3094 3095 void nmethod::print_code_comment_on(outputStream* st, int column, u_char* begin, u_char* end) { 3096 // First, find an oopmap in (begin, end]. 3097 // We use the odd half-closed interval so that oop maps and scope descs 3098 // which are tied to the byte after a call are printed with the call itself. 3099 address base = code_begin(); 3100 OopMapSet* oms = oop_maps(); 3101 if (oms != NULL) { 3102 for (int i = 0, imax = oms->size(); i < imax; i++) { 3103 OopMap* om = oms->at(i); 3104 address pc = base + om->offset(); 3105 if (pc > begin) { 3106 if (pc <= end) { 3107 st->move_to(column); 3108 st->print("; "); 3109 om->print_on(st); 3110 } 3111 break; 3112 } 3113 } 3114 } 3115 3116 // Print any debug info present at this pc. 3117 ScopeDesc* sd = scope_desc_in(begin, end); 3118 if (sd != NULL) { 3119 st->move_to(column); 3120 if (sd->bci() == SynchronizationEntryBCI) { 3121 st->print(";*synchronization entry"); 3122 } else { 3123 if (sd->method() == NULL) { 3124 st->print("method is NULL"); 3125 } else if (sd->method()->is_native()) { 3126 st->print("method is native"); 3127 } else { 3128 Bytecodes::Code bc = sd->method()->java_code_at(sd->bci()); 3129 st->print(";*%s", Bytecodes::name(bc)); 3130 switch (bc) { 3131 case Bytecodes::_invokevirtual: 3132 case Bytecodes::_invokespecial: 3133 case Bytecodes::_invokestatic: 3134 case Bytecodes::_invokeinterface: 3135 { 3136 Bytecode_invoke invoke(sd->method(), sd->bci()); 3137 st->print(" "); 3138 if (invoke.name() != NULL) 3139 invoke.name()->print_symbol_on(st); 3140 else 3141 st->print("<UNKNOWN>"); 3142 break; 3143 } 3144 case Bytecodes::_getfield: 3145 case Bytecodes::_putfield: 3146 case Bytecodes::_getstatic: 3147 case Bytecodes::_putstatic: 3148 { 3149 Bytecode_field field(sd->method(), sd->bci()); 3150 st->print(" "); 3151 if (field.name() != NULL) 3152 field.name()->print_symbol_on(st); 3153 else 3154 st->print("<UNKNOWN>"); 3155 } 3156 } 3157 } 3158 } 3159 3160 // Print all scopes 3161 for (;sd != NULL; sd = sd->sender()) { 3162 st->move_to(column); 3163 st->print("; -"); 3164 if (sd->method() == NULL) { 3165 st->print("method is NULL"); 3166 } else { 3167 sd->method()->print_short_name(st); 3168 } 3169 int lineno = sd->method()->line_number_from_bci(sd->bci()); 3170 if (lineno != -1) { 3171 st->print("@%d (line %d)", sd->bci(), lineno); 3172 } else { 3173 st->print("@%d", sd->bci()); 3174 } 3175 st->cr(); 3176 } 3177 } 3178 3179 // Print relocation information 3180 const char* str = reloc_string_for(begin, end); 3181 if (str != NULL) { 3182 if (sd != NULL) st->cr(); 3183 st->move_to(column); 3184 st->print("; {%s}", str); 3185 } 3186 int cont_offset = ImplicitExceptionTable(this).at(begin - code_begin()); 3187 if (cont_offset != 0) { 3188 st->move_to(column); 3189 st->print("; implicit exception: dispatches to " INTPTR_FORMAT, code_begin() + cont_offset); 3190 } 3191 3192 } 3193 3194 #ifndef PRODUCT 3195 3196 void nmethod::print_value_on(outputStream* st) const { 3197 st->print("nmethod"); 3198 print_on(st, NULL); 3199 } 3200 3201 void nmethod::print_calls(outputStream* st) { 3202 RelocIterator iter(this); 3203 while (iter.next()) { 3204 switch (iter.type()) { 3205 case relocInfo::virtual_call_type: 3206 case relocInfo::opt_virtual_call_type: { 3207 VerifyMutexLocker mc(CompiledIC_lock); 3208 CompiledIC_at(&iter)->print(); 3209 break; 3210 } 3211 case relocInfo::static_call_type: 3212 st->print_cr("Static call at " INTPTR_FORMAT, iter.reloc()->addr()); 3213 compiledStaticCall_at(iter.reloc())->print(); 3214 break; 3215 } 3216 } 3217 } 3218 3219 void nmethod::print_handler_table() { 3220 ExceptionHandlerTable(this).print(); 3221 } 3222 3223 void nmethod::print_nul_chk_table() { 3224 ImplicitExceptionTable(this).print(code_begin()); 3225 } 3226 3227 void nmethod::print_statistics() { 3228 ttyLocker ttyl; 3229 if (xtty != NULL) xtty->head("statistics type='nmethod'"); 3230 nmethod_stats.print_native_nmethod_stats(); 3231 nmethod_stats.print_nmethod_stats(); 3232 DebugInformationRecorder::print_statistics(); 3233 nmethod_stats.print_pc_stats(); 3234 Dependencies::print_statistics(); 3235 if (xtty != NULL) xtty->tail("statistics"); 3236 } 3237 3238 #endif // PRODUCT